16 bppc - supported or not ?

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DOS386
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16 bppc - supported or not ?

Post by DOS386 » Sun May 23, 2010 11:34 am

____ 1.97.1 Changelog

* NConvert support 16bits per component loading (-org_depth)
I can't find any option to "upgrade" an 8 bppc bitmap to 16 bppc, neither in NCONVERT nor in XNVIEW ... :-|

Can NC/XN perform any operation on both 8 bppc as well as 16 bppc bitmaps (I don't have 16 bppc bitmap files to test) ?

If YES, then the option to "upgrade" is either badly missing or just I can't find it ... please consider adding such (and the opposite 16 -> 8, optional for PNG saving, necessary for BMP JPG GIF(+palletize) ... ) :-)
There is indeed no WinZIP under my rock.

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xnview
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Re: 16 bppc - supported or not ?

Post by xnview » Tue May 25, 2010 7:06 am

Yes right, i must add such function
Pierre.

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DOS386
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Re: 16 bppc - supported or not ?

Post by DOS386 » Sun Jun 06, 2010 9:57 am

xnview wrote:Yes right, i must add such function
Please do :-) And compile among others a DOS version of NCONVERT. XN/NC will finally join the family of professional graphic tools :-)
There is indeed no WinZIP under my rock.

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Re: 16 bppc - supported or not ?

Post by xnview » Mon Jun 07, 2010 9:49 am

DOS386 wrote:
xnview wrote:Yes right, i must add such function
Please do :-) And compile among others a DOS version of NCONVERT. XN/NC will finally join the family of professional graphic tools :-)
After some thinking, i don't see the benefit to have 8=>16 bits :-)
Pierre.

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DOS386
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Re: 16 bppc - supported or not ?

Post by DOS386 » Sun Jun 13, 2010 12:57 am

xnview wrote:After some thinking, i don't see the benefit to have 8=>16 bits :-)
What about the GAMMA-BUG ? :bug:

http://newsgroup.xnview.com/viewtopic.php?t=14372 "Gamma Correct Resizing" 2008-Feb

http://newsgroup.xnview.com/viewtopic.php?t=19897 "Resize bug in most image processing programs?" 2010-Apr

http://www.4p8.com/eric.brasseur/gamma.html

http://www.poynton.com/notes/colour_and ... maFAQ.html

http://www.poynton.com/notes/colour_and ... orFAQ.html

Also the PNG specification covers this topic and is worth reading.

And, 16bppc will reduce the image quality degradation by repeated truncations if multiple edits are done :-)

To sum it up, I do see a very big benefit of 8=>16 bppc upgrade :-)
There is indeed no WinZIP under my rock.

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