Thread: [Lcms-user] Using LAB profiles in the real world
An ICC-based CMM for color management
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From: Richard H. <hug...@gm...> - 2010-06-23 17:26:37
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GCM currently allows users to install LAB profiles like "Sepia" and "Grayscale" but doesn't actually do anything useful with them. I'm intending to show the user a preview of what the profile would look like. To do this, I've got a RGB image that I want to "process" using the LAB space ICC profile, and then render a new pixbuf to the screen, again in RGB. What's the best way to achieve this with LCMS? I tried the obvious and got the "Output profile is operating on wrong colorspace" message. Thanks for any help, Richard. |
From: Pavel K. <ka...@gm...> - 2010-06-24 07:37:15
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Hi, basically if your image is not yet in Lab, you would need to do the conversion from RGB (source image) to Lab ... but then of course you can't display Lab pixels on your RGB monitor, so you need to convert again from Lab to RGB (monitor profile). Pavel On 23.6.2010, at 19:26, Richard Hughes wrote: > GCM currently allows users to install LAB profiles like "Sepia" and > "Grayscale" but doesn't actually do anything useful with them. I'm > intending to show the user a preview of what the profile would look > like. To do this, I've got a RGB image that I want to "process" using > the LAB space ICC profile, and then render a new pixbuf to the screen, > again in RGB. > > What's the best way to achieve this with LCMS? I tried the obvious and > got the "Output profile is operating on wrong colorspace" message. > > Thanks for any help, > > Richard. > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > Lcms-user mailing list > Lcm...@li... > https://lists.sourceforge.net/lists/listinfo/lcms-user --- Pavel Kanzelsberger http://www.kanzelsberger.com E-Mail: pa...@ka... Jabber: kan...@ja..., ICQ: 20990633 |
From: Richard H. <hug...@gm...> - 2010-06-24 07:58:40
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On 24 June 2010 08:37, Pavel Kanzelsberger <ka...@gm...> wrote: > basically if your image is not yet in Lab, you would need to do the conversion from RGB (source image) to Lab ... but then of course you can't display Lab pixels on your RGB monitor, so you need to convert again from Lab to RGB (monitor profile). Sure, but is there a way to do this automatically in LCMS? Richard. |
From: <jc...@gm...> - 2010-06-24 09:31:42
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On 24 June 2010 08:58, Richard Hughes <hug...@gm...> wrote: > On 24 June 2010 08:37, Pavel Kanzelsberger <ka...@gm...> wrote: >> basically if your image is not yet in Lab, you would need to do the conversion from RGB (source image) to Lab ... but then of course you can't display Lab pixels on your RGB monitor, so you need to convert again from Lab to RGB (monitor profile). > > Sure, but is there a way to do this automatically in LCMS? Profile connection space is LAB, so just import with an sRGB profile (if your RGB image is sRGB, some other profile otherwise) to get LAB, apply your transform, then export again to RGB. John |
From: Kai-Uwe B. <ku...@gm...> - 2010-06-24 09:06:04
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You mean abstract profiles. Assumedly you do not want Lab as output. Place the abstract or effect profile between source and destination profile and create a multi profile transform. e.g. sRGB(image) -> effect(sepia) -> output device(monitor) kind regards Kai-Uwe Behrmann Am 23.06.2010 19:26, schrieb Richard Hughes: > GCM currently allows users to install LAB profiles like "Sepia" and > "Grayscale" but doesn't actually do anything useful with them. I'm > intending to show the user a preview of what the profile would look > like. To do this, I've got a RGB image that I want to "process" using > the LAB space ICC profile, and then render a new pixbuf to the screen, > again in RGB. > > What's the best way to achieve this with LCMS? I tried the obvious and > got the "Output profile is operating on wrong colorspace" message. > |
From: Richard H. <hug...@gm...> - 2010-06-24 13:44:04
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On 24 June 2010 10:05, Kai-Uwe Behrmann <ku...@gm...> wrote: > You mean abstract profiles. Assumedly you do not want Lab as output. > Place the abstract or effect profile between source and destination > profile and create a multi profile transform. > e.g. sRGB(image) -> effect(sepia) -> output device(monitor) Brilliant, thanks. Working now. Richard. |