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Cannot save 48 bits SGI as PNG or FLIF
Posted: Wed May 11, 2016 6:30 pm
by omniplex
My first test with XnViewMP 0.79: Parkjoy frame 200 (a 48bits RGB SGI): Counting colors apparently works, more than 1,400,000. Save as FLIF failed, the result was an empty file (0 bytes) after some minutes. Save as PNG also failed, I got a 24bits PNG instead of a 48bits PNG. And apparently no PNG options. I also checked WebP, but without (obvious) options to request lossless I didn't test what actually happens if an image is saved as WebP.
Is that as it should be, XnViewMP cannot save more than 24 (or 32 with alpha) bits per pixel?
Re: Cannot save 48 bits SGI as PNG or FLIF
Posted: Tue May 17, 2016 8:45 am
by xnview
omniplex wrote:
Is that as it should be, XnViewMP cannot save more than 24 (or 32 with alpha) bits per pixel?
it can't save more than 24/32 bits per pixel
Re: Cannot save 48 bits SGI as PNG or FLIF
Posted: Tue May 17, 2016 6:50 pm
by omniplex
xnview wrote:omniplex wrote:
Is that as it should be, XnViewMP cannot save more than 24 (or 32 with alpha) bits per pixel?
it can't save more than 24/32 bits per pixel
Oops, I always thought that only classic is limited to 32 bits.
Are you planning to support up to 64 bits per pixel in MP or even classic?
It is not that I really
"need" it on my 2011 laptop, but there is a general trend to offer more bits per pixel, and to use some linear transformations instead of convoluted gamma and/or color profile tricks trying to squeeze more than 256 plausible values per channel into only 8 bits. Even
BMP can now do 3*10 bits RGB + 2 bits alpha for RGBA.