diff --git a/scripts/contrast-test.sh b/scripts/contrast-test.sh
index e06557d..85ebc6d 100755
--- a/scripts/contrast-test.sh
+++ b/scripts/contrast-test.sh
@@ -2,17 +2,27 @@
 
 GRAB="quux.fimg"
 COS01="cos01.fimg"
+COS010="cos010.fimg"
 SQRT="sqrt.fimg"
 POW2="pow2.fimg"
 
+# --------- conversion fimg -> pnm
 f2p ()
 {
-echo ========== $1
-fimg2pnm -v $1 $(basename $1 .fimg).pnm
+dst=$(basename $1 .fimg).pnm
+echo == converting $1 to $dst
+fimg2pnm  $1 $dst
 }
 
-grabvidseq -v -n 777 -p 0.07 -o $GRAB
-f2p $GRAB 
+# --------- capturer une image
+grabvidseq -v -n 77 -p 0.07 -o ${GRAB}
+echo ERRCODE $?
+f2p ${GRAB} 
+
+ls -rtl 
+exit
+
+# XXXXXXXXXXXXXXXXXXXXXX
 
 fimgfx -v pow2 $GRAB $POW2
 f2p $POW2
@@ -23,5 +33,7 @@ f2p $SQRT
 fimgfx -v cos01 $GRAB $COS01
 f2p $COS01
 
-convert -delay 10 *.pnm foo.gif
+fimgfx -v cos010 $GRAB $COS010
+f2p $COS010
 
+convert -delay 10 *.pnm foo.gif