Jessica Ledbetter

PNG – What color consistency?

PNG Problem Speaking to you about the importance of testing is like preaching to the choir. What browsers do you test on? If you develop on a PC, do you also check on the Mac? I basically ignore IE on Mac because that has the most quirks and the fewest users according to various logs I check. Safari on Mac, however, I rarely have problems with. If it works in Firefox, it usually renders the same in Safari. Surprise. Originally I had images on my site saved as PNG because it was a smaller file size with higher quality. I didn’t do transparencies with it since IE 6 has issues with that. But it seems PNG renders a little differently, color-wise, on Safari than the other browsers. What a “Gotcha.” I had to convert the graphics to .gif and now there should be no odd color differences between page edge and page background. And this is not a new problem:

In older versions of Opera and in pre-Tiger Safari, PNG colors don’t match CSS colors when there is no color space information stored in the PNG files. Also some old Mac versions of Mozilla and Netscape 6 applied a gamma change to unlabeled PNGs. – The Sad Story of PNG Gamma “Correction”

Lesson learned: When color consistency is necessary, beware the PNG.

3 Responses to PNG – What color consistency?

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