I am using IrfanView 4.25, but I have seen this bug from 3.92 upwards (and I believe it was started even earlier).
I have a GIF with my company logo and its background is transparent.
When I open this GIF into IrfanView - it does not recognize the transparent color and allways forces it to BLACK.
You will say that I can choose a transparent color when I save the GIF back - but then arises the real problem, because I have BLACK areas in my logo already.
So, when I try to save this GIF back - IrfanView allows me to set a transparent color by clicking. And I click on the background - but since it is now black (because of the wrong behaviour of IrfanView when loading the file in the beginning), as a result my logo has now transparent background AND the original black areas (the name of the company) are now ALSO transparent.
When I load/save the same GIF with another tool (Pixel Editor) - the transparent background is properly preserved.
I have tested other GIFs and ICOs - and each time the transparent color is silently converted to black by IrfanView.
You can check yourself using this address
http://crm.walltopia.com/test/images/menu/logo.gif
I have a GIF with my company logo and its background is transparent.
When I open this GIF into IrfanView - it does not recognize the transparent color and allways forces it to BLACK.
You will say that I can choose a transparent color when I save the GIF back - but then arises the real problem, because I have BLACK areas in my logo already.
So, when I try to save this GIF back - IrfanView allows me to set a transparent color by clicking. And I click on the background - but since it is now black (because of the wrong behaviour of IrfanView when loading the file in the beginning), as a result my logo has now transparent background AND the original black areas (the name of the company) are now ALSO transparent.
When I load/save the same GIF with another tool (Pixel Editor) - the transparent background is properly preserved.
I have tested other GIFs and ICOs - and each time the transparent color is silently converted to black by IrfanView.
You can check yourself using this address
http://crm.walltopia.com/test/images/menu/logo.gif
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