add contrast binding

README.md

@@ -12,16 +12,18 @@ Color values are specified using triplets of float values, like (128.5, 34.234,
 
 python-FloatImg requires a shared object file (.so) that is not yet officialy available from FloatImg.
 
-The file `floatimg/settings.py` contains the path to the .so file.
+The file `floatimg/settings.py` contains the path to the .so file and the encoding of path characters.
 
 ## Usage
 
-The FloatImg class encapsulate core and file functionnalities of FloatImg library. Import if from the main module:
-
 ```python
 import floatimg
 ```
 
+The FloatImg class encapsulate core and file functionnalities of FloatImg library. Instances are created with functions from the module.
+
+Colors are tuple of three elements `(r, g, b)`.
+
 ### Image creation
 
 `FloatImg` has two class methods to create an image.
@@ -47,62 +49,98 @@ new_img = img.clone()
 new_img = img.clone(True)
 ```
 
-### Image manipulation
-
-#### Clear image
-
-Reset all pixels to zero.
+### Basic pixel operations
 
 ```python
+# Get pixel value
+color = (r, g, b) = img.get(x, y)
+
+# Set pixel value
+img.put(x, y, (r, g, b))
+
+# Reset all pixels to zero.
 img.clear()
-```
 
-#### Copy pixels to another image
-
-```python
+# Copy pixels to another image of the same format
 img.copy_data(another_img)
 ```
 
-#### Set pixel value
+### File operations
+
+#### Raw dump files
 
 ```python
-img.put(x, y, (r, g, b))
+# Dump image to file
+img.dump(path)
+
+# Restore image data from a dump file
+img.load(path)
+
+# Create a new image from a dump file
+img = floatimg.create_from_dump(path)
+
+# Get dump metadata (TODO create a FileInfo named tuple)
+witdh, height, img_type = floatimg.fileinfos(path)
 ```
 
-#### Get pixel value
+#### External formats
 
 ```python
-color = (r, g, b) = img.get(x, y)
+# export supports the following extentions : .fimg, .png, .tiff, .pnm, .fits
+# save as png
+img.export("test.png")
+
+# create an image instance from png file
+img = floatimg.create_from_png("test.png")
+
+# load pixel data from png file in an existing instance. size and type have to be compatible
+img.load_png("test.png")
 ```
 
-### File manipulation
 
-#### Dump image to file
+## Operators
 
 ```python
-img.dump("/tmp/image_dump")
+# addition
+res_img = img + img2
+
+# substraction
+res_img = img - img2
+
+# multiplication
+res_img = img * img2
+
+# min value per color channel
+res_img = img.min(img2)
+
+# max value per color channel
+res_img = img.max(img2)
+
 ```
 
-#### Restore image data from a dump file
+## Contrast operations
 
-```python
-img.load("/tmp/image_dump")
+Contrast types are defined in the Contrast enumeration:
+
+```
+floatimg.Contrast.SQRT
+floatimg.Contrast.POW2
+floatimg.Contrast.COS01
+floatimg.Contrast.COS010
 ```
 
-#### Create a new image from a dump file
+To apply contrast:
 
-```python
-img = floatimg.create_from_dump("/tmp/image_dump")
 ```
-#### Get dump metadata
+# Return a new image
+res = img.contrast(value, floatimg.Contrast.SQRT)
 
-TODO create a FileInfo named tuple.
-
-```python
-witdh, height, img_type = floatimg.fileinfos("/tmp/image_dump")
+# set contrast in-place
+img.contrast(value, floatimg.Contrast.SQRT, True)
 ```
 
 
+
 ## Development
 
 ### Run tests
@@ -119,3 +157,18 @@ Ensure `floatimg` containing path is in the `PYTHONPATH`, this will run the test
 pytest --cov=floatimg tests/*
 ```
 
+### Status
+
+The goal is not to bind all the functions but essential ones too build a front-end with python-tkinter. 
+
+#### Done
+
+ - lib/fimg-core.c
+ - lib/fimg-file.c
+ - lib/operator.c
+ - funcs/exporter.c
+ - funcs/fimg-png.c
+
+#### Partial
+
+ - lib/fimg-math.c

floatimg/__init__.py

@@ -1,6 +1,16 @@
 """Python Binding to FloatImg """
 
-# FloatImg class and static functions
-from floatimg.image import FloatImg, create, create_rgb, create_from_dump, GRAY, RGB, fileinfos
+# FloatImg class, constants & static functions
+from floatimg.image import (
+    GRAY,
+    RGB,
+    FloatImg,
+    create,
+    create_rgb,
+    create_from_dump,
+    create_from_png,
+    fileinfos,
+    Contrast
+)
 
 __version__ = "0.0.1"

floatimg/image.py

@@ -1,13 +1,26 @@
+"""Binding bases"""
 import ctypes as ct
+from enum import Enum
+import logging
 
-from floatimg.settings import LIB
+from floatimg.settings import LIB, PATH_ENCODING
 
 ############################################################################################################
 # type constants
 GRAY = 1
 RGB = 3
-RGBA = 4
-RGBZ = 99
+RGBA = 4  # may not be used
+RGBZ = 99  # may not be used
+
+############################################################################################################
+# Contrast enumeration
+class Contrast(Enum):
+    NONE = 0
+    SQRT = 1
+    POW2 = 2
+    COS01 = 3
+    COS010 = 4
+
 
 ############################################################################################################
 # Type mapping
@@ -32,7 +45,9 @@ C_FloatImg._fields_ = [
 ]
 
 ############################################################################################################
-# declaration of input / output types
+# declaration of input / output types for C binding of core functions
+
+# fimg-core.c
 c_fimgcreate = LIB.fimg_create
 c_fimgcreate.argtypes = (ct.POINTER(C_FloatImg), ct.c_int, ct.c_int, ct.c_int)
 c_fimgcreate.restype = ct.c_int
@@ -61,7 +76,6 @@ c_fimg_clear = LIB.fimg_clear
 c_fimg_clear.argtypes = (ct.POINTER(C_FloatImg),)
 c_fimg_clear.restype = ct.c_int
 
-
 c_fimg_plot_rgb = LIB.fimg_plot_rgb
 c_fimg_plot_rgb.argtypes = (
     ct.POINTER(C_FloatImg),
@@ -73,8 +87,6 @@ c_fimg_plot_rgb.argtypes = (
 )
 c_fimg_plot_rgb.restype = ct.c_int
 
-
-# int   fimg_get_rgb(FloatImg *head, int x, int y, float *rgb);
 c_fimg_get_rgb = LIB.fimg_get_rgb
 c_fimg_get_rgb.argtypes = (
     ct.POINTER(C_FloatImg),
@@ -84,7 +96,6 @@ c_fimg_get_rgb.argtypes = (
 )
 c_fimg_get_rgb.restype = ct.c_int
 
-# int   fimg_put_rgb(FloatImg *head, int x, int y, float *rgb);
 c_fimg_put_rgb = LIB.fimg_put_rgb
 c_fimg_put_rgb.argtypes = (
     ct.POINTER(C_FloatImg),
@@ -103,6 +114,7 @@ c_fimg_rgb_constant.argtypes = (
 )
 c_fimg_rgb_constant.restype = ct.c_int
 
+# fimg-file.c
 c_fimg_dump_to_file = LIB.fimg_dump_to_file
 c_fimg_dump_to_file.argtypes = (ct.POINTER(C_FloatImg), ct.c_char_p, ct.c_int)
 c_fimg_dump_to_file.restype = ct.c_int
@@ -115,6 +127,104 @@ c_fimg_fileinfos = LIB.fimg_fileinfos
 c_fimg_fileinfos.argtypes = (ct.c_char_p, ct.POINTER(ct.c_int * 3))
 c_fimg_fileinfos.restype = ct.c_int
 
+c_fimg_add_rgb = LIB.fimg_add_rgb
+c_fimg_add_rgb.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.c_int,
+    ct.c_int,
+    ct.c_float,
+    ct.c_float,
+    ct.c_float,
+)
+c_fimg_add_rgb.restype = ct.c_int
+
+# # fimg-operators.c
+c_fimg_add_3 = LIB.fimg_add_3
+c_fimg_add_3.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+)
+c_fimg_add_3.restype = ct.c_int
+
+c_fimg_sub_3 = LIB.fimg_sub_3
+c_fimg_sub_3.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+)
+c_fimg_sub_3.restype = ct.c_int
+
+c_fimg_mul_3 = LIB.fimg_mul_3
+c_fimg_mul_3.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+)
+c_fimg_mul_3.restype = ct.c_int
+
+c_fimg_minimum = LIB.fimg_minimum
+c_fimg_minimum.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+)
+c_fimg_minimum.restype = ct.c_int
+
+c_fimg_maximum = LIB.fimg_maximum
+c_fimg_maximum.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+)
+c_fimg_maximum.restype = ct.c_int
+
+# Files i/o
+c_fimg_export_picture = LIB.fimg_export_picture
+c_fimg_export_picture.argtypes = (ct.POINTER(C_FloatImg), ct.c_char_p)
+c_fimg_export_picture.restype = ct.c_int
+
+c_fimg_create_from_png = LIB.fimg_create_from_png
+c_fimg_create_from_png.argtypes = (ct.c_char_p, ct.POINTER(C_FloatImg))
+c_fimg_create_from_png.restype = ct.c_int
+
+c_fimg_load_from_png = LIB.fimg_load_from_png
+c_fimg_load_from_png.argtypes = (ct.c_char_p, ct.POINTER(C_FloatImg))
+c_fimg_load_from_png.restype = ct.c_int
+
+c_fimg_get_maxvalue = LIB.fimg_get_maxvalue
+c_fimg_get_maxvalue.argtypes = (ct.POINTER(C_FloatImg),)
+c_fimg_get_maxvalue.restype = ct.c_float
+
+# contrast
+c_fimg_square_root = LIB.fimg_square_root
+c_fimg_square_root.argtypes = (
+    ct.POINTER(C_FloatImg),
+    ct.POINTER(C_FloatImg),
+    ct.c_double,
+)
+c_fimg_square_root.restype = ct.c_int
+
+c_fimg_power_2 = LIB.fimg_power_2
+c_fimg_power_2.argtypes = (ct.POINTER(C_FloatImg), ct.POINTER(C_FloatImg), ct.c_double)
+c_fimg_power_2.restype = ct.c_int
+
+c_fimg_cos_01 = LIB.fimg_cos_01
+c_fimg_cos_01.argtypes = (ct.POINTER(C_FloatImg), ct.POINTER(C_FloatImg), ct.c_double)
+c_fimg_cos_01.restype = ct.c_int
+
+c_fimg_cos_010 = LIB.fimg_cos_010
+c_fimg_cos_010.argtypes = (ct.POINTER(C_FloatImg), ct.POINTER(C_FloatImg), ct.c_double)
+c_fimg_cos_010.restype = ct.c_int
+
+# contrast function map
+CONTRAST_FUNC_DICT = {
+    Contrast.SQRT: c_fimg_square_root,
+    Contrast.POW2: c_fimg_power_2,
+    Contrast.COS01: c_fimg_cos_01,
+    Contrast.COS010: c_fimg_cos_010,
+}
+
 ############################################################################################################
 class FloatImg:
     """
@@ -126,17 +236,11 @@ class FloatImg:
     """
 
     # proxy attributes to the C_FloatImg structure
-    # TODO: now more about them
+    # TODO: now more about them ;)
     magic = property(lambda self: self.c_img.magic)
     fval = property(lambda self: self.c_img.fval)
     count = property(lambda self: self.c_img.count)
 
-    # oh yeah, really really sluggish access to pixels img.R[0].contents
-    # however, pixel data are not designed to be accessed this way
-    # R = property(
-    #     lambda self: pointer(self.c_img.contents.R)[: self.width * self.height]
-    # )
-
     #######################################################################################################
     def __init__(self, c_img):
         self.c_img = c_img
@@ -153,6 +257,7 @@ class FloatImg:
     #######################################################################################################
     def destroy(self):
         """destroy the underlying structure. automattically called at instance destruction"""
+        logging.debug("Destroy %s", self)
         assert c_fimg_destroy(self.c_img) == 0
 
     #######################################################################################################
@@ -167,13 +272,9 @@ class FloatImg:
     #######################################################################################################
     def clone(self, copy_data=False):
         """return a clone of the current instance"""
-        if copy_data:
-            flags = 1
-        else:
-            flags = 0
-        new_pic = C_FloatImg()
-        assert c_fimg_clone(self.c_img_p, ct.pointer(new_pic), flags) == 0
-        return FloatImg(new_pic)
+        c_img_p = C_FloatImg()
+        assert c_fimg_clone(self.c_img_p, ct.pointer(c_img_p), int(copy_data)) == 0
+        return FloatImg(c_img_p)
 
     #######################################################################################################
     def copy_data(self, to_img):
@@ -192,45 +293,115 @@ class FloatImg:
     #######################################################################################################
     def get(self, x, y):
         """get r,g,b triplet from a pixel"""
-        rgb = (ct.c_float * 3)()
-        assert c_fimg_get_rgb(self.c_img_p, x, y, ct.pointer(rgb)) == 0
-        return rgb[:3]
+        color = (ct.c_float * 3)()
+        assert c_fimg_get_rgb(self.c_img_p, x, y, ct.pointer(color)) == 0
+        return color[:3]
 
     #######################################################################################################
-    def put(self, x, y, rgb):
-        """put r,g,b triplet to a pixel"""
-        # TODO may be a better way to create the array rather than iterating
-        c_rgb = (ct.c_float * 3)()
-        for i, c in enumerate(rgb):
-            c_rgb[i] = c
+    def put(self, x, y, color):
+        """put color to a pixel"""
+        c_rgb = (ct.c_float * 3)(*color)
         assert c_fimg_put_rgb(self.c_img_p, x, y, ct.pointer(c_rgb)) == 0
 
     #######################################################################################################
-    def dump(self, fname):
+    def add(self, x, y, color):
+        """add color to a pixel """
+        assert c_fimg_add_rgb(self.c_img_p, x, y, *color) == 0
+
+    #######################################################################################################
+    def dump(self, path):
         """save data to a dump file"""
         # TODO use system encoding instead of utf-8
         assert (
             c_fimg_dump_to_file(
-                self.c_img_p, ct.c_char_p(bytes(fname, encoding="utf8")), 0
+                self.c_img_p, ct.c_char_p(bytes(path, encoding=PATH_ENCODING)), 0
             )
             == 0
         )
 
     #######################################################################################################
-    def load(self, fname):
+    def load(self, path):
         """load data from a dump. size and type have to be compatible"""
         assert (
             c_fimg_load_from_dump(
-                ct.c_char_p(bytes(fname, encoding="utf8")), self.c_img_p
+                ct.c_char_p(bytes(path, encoding=PATH_ENCODING)), self.c_img_p
             )
             == 0
         )
 
-    # TODO
-    # fimg_plot_rgb
-    # fimg_add_rgb
+    #######################################################################################################
+    def load_png(self, path):
+        """load data from a png file. size and type have to be compatible"""
+        assert (
+            c_fimg_load_from_png(
+                ct.c_char_p(bytes(path, encoding=PATH_ENCODING)), self.c_img_p
+            )
+            == 0
+        )
 
-    # export(fname, flags) : depending file extension, save to the correct format
+    #######################################################################################################
+    def __add__(self, img):
+        """ + operator overload"""
+        res = self.clone(False)
+        assert c_fimg_add_3(self.c_img_p, img.c_img_p, res.c_img_p) == 0
+        return res
+
+    #######################################################################################################
+    def __sub__(self, img):
+        """ - operator overload"""
+        res = self.clone(False)
+        assert c_fimg_sub_3(self.c_img_p, img.c_img_p, res.c_img_p) == 0
+        return res
+
+    #######################################################################################################
+    def __mul__(self, img):
+        """ * operator overload"""
+        res = self.clone(False)
+        assert c_fimg_mul_3(self.c_img_p, img.c_img_p, res.c_img_p) == 0
+        return res
+
+    #######################################################################################################
+    def min(self, img):
+        """return a new image with minimum pixel values per channel between current and parameter"""
+        res = self.clone(False)
+        # C code inverts comparison
+        assert c_fimg_minimum(self.c_img_p, img.c_img_p, res.c_img_p) == 0
+        return res
+
+    #######################################################################################################
+    def max(self, img):
+        """return a new image with maximum pixel values per channel between current and parameter"""
+        res = self.clone(False)
+        # C code inverts comparison
+        assert c_fimg_maximum(self.c_img_p, img.c_img_p, res.c_img_p) == 0
+        return res
+
+    #######################################################################################################
+    def export(self, path):
+        """export image to path. allowed extension: .fimg, .png, .tiff, .pnm, .fits"""
+        assert (
+            c_fimg_export_picture(
+                self.c_img_p, ct.c_char_p(bytes(path, encoding=PATH_ENCODING)), 0
+            )
+            == 0
+        )
+
+    #######################################################################################################
+    def maxvalue(self):
+        """return the maximum value for any channel in the image"""
+        return c_fimg_get_maxvalue(self.c_img_p)
+
+    #######################################################################################################
+    def contrast(self, max_value, contrast_id=Contrast.SQRT, in_place=False):
+        """"""
+        func = CONTRAST_FUNC_DICT[contrast_id]
+        dest = None
+        dest_c_img = None
+        if not in_place:
+            dest = self.clone(False)
+            dest_c_img = dest.c_img_p
+        assert (func(self.c_img, dest_c_img, max_value)) == 0
+        return dest
 
 
 ###########################################################################################################
@@ -238,7 +409,9 @@ def fileinfos(fname):
     """return witdh, height, img_type triplet read from a dump file"""
     datas = (ct.c_int * 3)()
     assert (
-        c_fimg_fileinfos(ct.c_char_p(bytes(fname, encoding="utf8")), ct.pointer(datas))
+        c_fimg_fileinfos(
+            ct.c_char_p(bytes(fname, encoding=PATH_ENCODING)), ct.pointer(datas)
+        )
         == 0
     )
     return datas[:3]
@@ -260,14 +433,25 @@ def create_rgb(witdh, height):
 
 
 ###########################################################################################################
-def create_from_dump(fname):
-    """Create a new instance from a dump file"""
-    witdh, height, img_type = fileinfos(fname)
+def create_from_dump(path):
+    """Create a FloatImg instance from a dump file"""
+    witdh, height, img_type = fileinfos(path)
     img = create(witdh, height, img_type)
-    img.load(fname)
+    img.load(path)
     return img
 
 
+###########################################################################################################
+def create_from_png(path):
+    """Create a FloatImg instance from a png file"""
+    img = C_FloatImg()
+    assert (
+        c_fimg_create_from_png(ct.c_char_p(bytes(path, encoding=PATH_ENCODING)), img)
+        == 0
+    )
+    return FloatImg(img)
+
+
 ###########################################################################################################
 def type_is_valid(type_id):
     """return True if type_id is a valid one"""

floatimg/settings.py

@@ -1,5 +1,5 @@
 import ctypes
 
-# LIB = ctypes.cdll.LoadLibrary("../FloatImg/libfloatimg.so")
+PATH_ENCODING = "utf8"
 
 LIB = ctypes.cdll.LoadLibrary("../FloatImg4PythonBinding/build/lib/libfloatimg.so")

tests/basics.py

@@ -54,7 +54,6 @@ def test_rgb_constant():
             assert img.get(x, y) == color
 
 
-
 def test_copy_data():
     width = 5
     height = 5
@@ -104,3 +103,76 @@ def test_put_rgb():
     assert img.get(0, 0) == [0.0, 0.0, 0.0]
     img.put(0, 0, (127.0, 127.0, 127.0))
     assert img.get(0, 0) == [127.0, 127.0, 127.0]
+
+
+def test_add():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    color = (32.0, 32.0, 32.0)
+    img.put(0, 0, color)
+    img.add(0, 0, color)
+    assert img.get(0, 0) == [64.0, 64.0, 64.0]
+
+
+def test_op_add():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    color = (32.0, 32.0, 32.0)
+    img.fill(color)
+    img2 = floatimg.create_rgb(width, height)
+    img2.fill(color)
+    img3 = img + img2
+    for y in range(height):
+        for x in range(width):
+            assert img3.get(x, y) == [64.0, 64.0, 64.0]
+
+
+def test_op_sub():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    color = (32.0, 32.0, 32.0)
+    img.fill(color)
+    img2 = floatimg.create_rgb(width, height)
+    img2.fill(color)
+    img3 = img - img2
+    for y in range(height):
+        for x in range(width):
+            assert img3.get(x, y) == [0.0, 0.0, 0.0]
+
+
+def test_op_mul():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    color = (32.0, 32.0, 32.0)
+    img.fill(color)
+    img2 = floatimg.create_rgb(width, height)
+    img2.fill((2.0, 2.0, 2.0))
+    img3 = img * img2
+    for y in range(height):
+        for x in range(width):
+            assert img3.get(x, y) == [64.0, 64.0, 64.0]
+
+def test_op_min():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    img.fill((32.0, 0.0, 32.0))
+
+    img2 = floatimg.create_rgb(width, height)
+    img2.fill((0.0, 32.0, 0.0))
+    img3 = img.min(img2)
+    for y in range(height):
+        for x in range(width):
+            assert img3.get(x, y) == [0.0, 0.0, 0.0]
+
+
+def test_op_max():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    img.fill((32.0, 0.0, 32.0))
+
+    img2 = floatimg.create_rgb(width, height)
+    img2.fill((0.0, 32.0, 0.0))
+    img3 = img.max(img2)
+    for y in range(height):
+        for x in range(width):
+            assert img3.get(x, y) == [32.0, 32.0, 32.0]

tests/contrast.py

@@ -0,0 +1,35 @@
+import floatimg
+import logging
+
+
+def test_square():
+    width, height = 5, 5
+
+    color = [127.0, 127.0, 127.0]
+    img = floatimg.create_rgb(width, height)
+    img.fill(color)
+    img.put(2, 2, [200, 200, 200])
+
+    result_dict = {
+        floatimg.Contrast.SQRT: (
+            [225.83180236816406, 225.83180236816406, 225.83180236816406],
+            [179.9583282470703, 179.9583282470703, 179.9583282470703],
+        ),
+        floatimg.Contrast.POW2: (
+            [156.8627471923828, 156.8627471923828, 156.8627471923828],
+            [63.250980377197266, 63.250980377197266, 63.250980377197266],
+        ),
+        floatimg.Contrast.COS01: (
+            [226.83277893066406, 226.83277893066406, 226.83277893066406],
+            [126.71460723876953, 126.71460723876953, 126.71460723876953],
+        ),
+        floatimg.Contrast.COS010: (
+            [100.2235336303711, 100.2235336303711, 100.2235336303711],
+            [254.99032592773438, 254.99032592773438, 254.99032592773438],
+        ),
+    }
+
+    for contrast_type, (center, outer) in result_dict.items():
+        res = img.contrast(255, contrast_type)
+        assert res.get(2, 2) == center
+        assert res.get(2, 3) == outer

tests/files.py

@@ -0,0 +1,28 @@
+import os
+
+import floatimg
+
+def create_img():
+    width, height = 5, 5
+    img = floatimg.create_rgb(width, height)
+    img.fill((255.0, 0.0, 0.0))
+    return img
+
+def test_png():
+    width, height = 5, 5
+    path = "test.png"
+    img = create_img()
+    img.export(path)
+    assert os.path.getsize(path) == 74
+    img2 = floatimg.create_from_png(path)
+    for y in range(height):
+        for x in range(width):
+            assert img.get(x, y) == img2.get(x, y)
+
+    img3 = img2.clone(False)
+    img3.load_png(path)
+    for y in range(height):
+        for x in range(width):
+            assert img.get(x, y) == img3.get(x, y)
+
+

tests/maths.py

@@ -0,0 +1,12 @@
+"""test of core functions """
+
+import floatimg
+
+def test_maxvaalue():
+    width = 5
+    height = 5
+
+    img = floatimg.create_rgb(width, height)
+    color = (255.0, 255.0, 255.0)
+    img.put(2,2, color)
+    assert img.maxvalue() == 255.0