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-rw-r--r--generic/tkImgPPM.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tkImgPPM.c b/generic/tkImgPPM.c
index d71db25..ddd16b2 100644
--- a/generic/tkImgPPM.c
+++ b/generic/tkImgPPM.c
@@ -595,7 +595,7 @@ StringReadPPM(
unsigned char *p;
unsigned int value;
- for (p = pixelPtr; count > 0; count--, p += 2) {
+ for (p = pixelPtr,count=nBytes; count > 1; count-=2, p += 2) {
value = ((unsigned int) p[0]) * 256 + ((unsigned int) p[1]);
value = value * 255 / maxIntensity;
p[0] = p[1] = (unsigned char) value;