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1.93.4: Alpha applied during save operations
Posted: Mon Apr 14, 2008 2:45 am
by silverfire
When saving BMP screenshots saved using Media Player Classic, I end up with completely blank JPEG files. I explicitly saved as 24-bit using CS3 and it image data was actually there again.
I had 'Use alpha channel' unchecked in View, so shouldn't saving files obey this value as well?
It didn't do this in older versions and I'd like to at least have the option to change this behavior.
Thanks!
Re: [1.93.4] Alpha applied during save operations
Posted: Mon Apr 14, 2008 9:15 am
by xnview
When you convert BMP (with alpha) into JPEG, the alpha is applied. So if the alpha is bad, you have a problem. So perhaps i need to add 'remove alpha' or 'convert to 24bits without alpha'. What do you think?
Posted: Mon Apr 14, 2008 9:18 am
by silverfire
Converting to 24 bits without alpha would be useful whenever you save a screenshot as bitmap in Media Player Classic, XnView sees it as 32 bit even though the entire alpha channel makes the image transparent.
How would it be implemented anyway? Would it be feasible as a read option under bitmap or would it be implemented as a save feature under JPEG files?
I was also curious as to how this issue came about, as it didn't happen at all when I was using 1.91.
Posted: Mon Apr 14, 2008 9:20 am
by xnview
Perhaps better will be to have in option/Read/Ignore alpha channel. What do you think?
Posted: Mon Apr 14, 2008 9:22 am
by silverfire
Having an option to ignore alpha channel in bitmaps would certainly fix my issue.