http://community.acdsee.com/forums/ ACDSee Forums Topic: BUG: white background go to colored when change color depth en Tue, 06 Jan 2009 20:02:42 +0000 http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-29320 Wed, 15 Oct 2008 09:20:52 +0000 OlsenOlsen 29320@http://community.acdsee.com/forums/ <p>And what we can do?! :)</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-29059 Fri, 10 Oct 2008 12:46:25 +0000 moongate 29059@http://community.acdsee.com/forums/ <p>Since ACDsee does not seems to have a brightness contrast function like in Photoshop (the brightness function of ACDsee is working on an exposure type of algorithm) I just included a second sample that shows what happens if the brightness is lowered in a different application.</p> <p>Moongate</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-29058 Fri, 10 Oct 2008 12:42:06 +0000 moongate 29058@http://community.acdsee.com/forums/ <p>OK, I just tried it myself and this seems to be a bug.</p> <p>I converted a 1000x1000 pixel 24Bit color (= 3 times 8-Bit per chanel RGB) to 16 Colors.</p> <p>White went from 255,255,255 to 252,254,251</p> <p>See the sample I provide.</p> <p>If you look at the sample you will hardly see any difference. The problem comes when you want to tweak the image any further. Give it the try and load the image in the editor then lower the brightness. The white side will stay white the other side will get brownish.</p> <p>Moongate</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-29041 Fri, 10 Oct 2008 06:05:39 +0000 OlsenOlsen 29041@http://community.acdsee.com/forums/ <p>I convert from 24-bit (with pure white BG) to 4-bit (and&nbsp;always have colored BG&nbsp;as result).</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-28995 Thu, 09 Oct 2008 14:17:19 +0000 moongate 28995@http://community.acdsee.com/forums/ <p>Hello Olsen,</p> <p>&nbsp;</p> <p>just to understand you right before going on. Are you converting from 16 or 256 colors to 16.7 Mio or the other way around?</p> <p>&nbsp;</p> <p>Moongate</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-28987 Thu, 09 Oct 2008 12:06:33 +0000 OlsenOlsen 28987@http://community.acdsee.com/forums/ <p>original file "64706_3.tif" with white background: [attachment=0]</p> <p>Result: 64706_4.tif with NOT white background [attachment=1]</p> <p>P.S. Images converted to JPG for post to web</p> http://community.acdsee.com/forums/topic/bug-white-background-go-to-colored-when-change-color-depth#post-28986 Thu, 09 Oct 2008 12:01:39 +0000 OlsenOlsen 28986@http://community.acdsee.com/forums/ <p>Hello!</p> <p>BUG: white background go to light colored when change color depth to 16 or 256 colors</p> <p>Test: open original file "64706_3.tif" with white background, modify - Change Color Depth - 16 colors (or 256 colors).</p> <p>Result: 64706_4.tif with NOT white background.</p> <p>This BUG is very inmportant for processing of documents scans!</p> <p>Solution: make option like in Photoshop "Preserve white, black colors" for color depth conversion.</p> <p>Thanks!</p>