Colour difference when saving as PNG

S
Posted By
spirelli
Oct 25, 2006
Views
279
Replies
4
Status
Closed
Hi,

I’m trying to save an imge for the web to match the website’s background colour. That works perfectly when saving the image as a GIF file through the "Save for Web" feature. However, when saving it as a PNG file (which I want) the background is lighter.

Why is that and how can I fix it?
Many thanks.
Related Tags
color difference png save

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S
spirelli
Oct 25, 2006
Actually, the PNG seems to display correctly in Safari but not in Firefox (where the colour is way off)

So, what is happening?
G
glennrp
Oct 25, 2006
wrote:
Hi,

I’m trying to save an imge for the web to match the website’s background colour. That works perfectly when saving the image as a GIF file through the "Save for Web" feature. However, when saving it as a PNG file (which I want) the background is lighter.

Why is that and how can I fix it?
Many thanks.

It’s a longstanding Internet Explorer bug in the handling of the PNG gAMA chunk.
The bug persists even in IE7.

If you remove the gAMA chunk your image should match the background. Or if
you view the image with Firefox, Mozilla, Opera (anything but IE) it’ll be OK.

pngcrush -rem gAMA in.png out.png
CB
charles badland
Oct 25, 2006
Do a search here and on the web for PNG + Gamma. I think there is some problem with the PNG format gamma, but can’t recall.
B
Buko
Oct 25, 2006
Safari is color managed and Firefox is not?

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