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#1
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Photoshop CS 16-bit image limitations
Now that Photoshop supports 16-bit adjustment layers, I've been
working in 16 bits a lot more -- and am discovering various other limitations. For one thing, the histogram display remains small and low-resolution. (Reindeer Graphics has a free "wide histogram" plugin that will give you a 1024-position histogram at http://www.reindeergraphics.com/free.shtml). For another, in the Color Picker, at least when entering RGB colors numerically, you can only enter values from 0 to 255. I don't know if this means that sampled colors (eyedropper) are snapped to that as well; I think it'd have to since that's all that can be displayed in the color picker. I started this to check a rumor that photoshop only really supported 15 bits per channel -- that a 16-bit file would actually get reduced to 15. Wasn't able to carry through my test on that, since I couldn't reliably enter and display 16-bit colors numerically. -- David Dyer-Bennet, , http://www.dd-b.net/dd-b/ RKBA: http://noguns-nomoney.com/ http://www.dd-b.net/carry/ Pics: http://dd-b.lighthunters.net/ http://www.dd-b.net/dd-b/SnapshotAlbum/ Dragaera/Steven Brust: http://dragaera.info/ |
#2
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"David Dyer-Bennet" wrote in message ... SNIP I started this to check a rumor that photoshop only really supported 15 bits per channel -- that a 16-bit file would actually get reduced to 15. It's no rumor, you can see it in the info panel (can be switched to 16-bit number display and won't exceed 32768, or 2^15+1), and it's been discussed by Chris Cox (one of the programmers) in newsgroups. Bart |
#3
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"David Dyer-Bennet" wrote in message ... SNIP I started this to check a rumor that photoshop only really supported 15 bits per channel -- that a 16-bit file would actually get reduced to 15. It's no rumor, you can see it in the info panel (can be switched to 16-bit number display and won't exceed 32768, or 2^15+1), and it's been discussed by Chris Cox (one of the programmers) in newsgroups. Bart |
#4
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"Bart van der Wolf" writes:
"David Dyer-Bennet" wrote in message ... SNIP I started this to check a rumor that photoshop only really supported 15 bits per channel -- that a 16-bit file would actually get reduced to 15. It's no rumor, you can see it in the info panel (can be switched to 16-bit number display and won't exceed 32768, or 2^15+1), and it's been discussed by Chris Cox (one of the programmers) in newsgroups. Well, Chris should know! Thanks. Didn't think of looking at the "info" panel; you say it can be switched to 16-bit display? How? -- David Dyer-Bennet, , http://www.dd-b.net/dd-b/ RKBA: http://noguns-nomoney.com/ http://www.dd-b.net/carry/ Pics: http://dd-b.lighthunters.net/ http://www.dd-b.net/dd-b/SnapshotAlbum/ Dragaera/Steven Brust: http://dragaera.info/ |
#5
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"Bart van der Wolf" writes:
"David Dyer-Bennet" wrote in message ... SNIP I started this to check a rumor that photoshop only really supported 15 bits per channel -- that a 16-bit file would actually get reduced to 15. It's no rumor, you can see it in the info panel (can be switched to 16-bit number display and won't exceed 32768, or 2^15+1), and it's been discussed by Chris Cox (one of the programmers) in newsgroups. Well, Chris should know! Thanks. Didn't think of looking at the "info" panel; you say it can be switched to 16-bit display? How? -- David Dyer-Bennet, , http://www.dd-b.net/dd-b/ RKBA: http://noguns-nomoney.com/ http://www.dd-b.net/carry/ Pics: http://dd-b.lighthunters.net/ http://www.dd-b.net/dd-b/SnapshotAlbum/ Dragaera/Steven Brust: http://dragaera.info/ |
#6
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"David Dyer-Bennet" wrote in message ... SNIP Didn't think of looking at the "info" panel; you say it can be switched to 16-bit display? How? Open an image, make sure it is in 16-b/ch mode. Select the Info panel, and select its options (top right circular arrow button), choose Palette Options..., and tick the box in front of "Show 16 bit values". Bart |
#7
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"David Dyer-Bennet" wrote in message ... SNIP Didn't think of looking at the "info" panel; you say it can be switched to 16-bit display? How? Open an image, make sure it is in 16-b/ch mode. Select the Info panel, and select its options (top right circular arrow button), choose Palette Options..., and tick the box in front of "Show 16 bit values". Bart |
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