Fwd: [sane-devel] use of ICC profiles

[Karl Heinz Kremer]

This reply was meant to go to the list as well:

Begin forwarded message:

> From: Karl Heinz Kremer <khk@khk.net>
> Date: July 7, 2004 8:41:12 PM EDT
> To: Peter Mark Guevarra <pmsguevarra@yahoo.com>
> Subject: Re: [sane-devel] use of ICC profiles
>
> Like so many great questions, your question can only be answered with 
> "depends...". :-)
>
> An ICC profile is a tool to color correct predictable color problems 
> of a device. So, if your scanner always produces the same wrong color 
> for the same input color, an ICC profile can help. For this to work, 
> you need software that can create an ICC profile based on a reference 
> image. What you usually do is scan e.g. an IT8 target 
> (http://www.targets.coloraid.de/), then feed the scan plus a 
> description of all the correct color values on the target to a 
> profiler (e.g. http://www.scarse.org). This will then create a target 
> for your scanner when it's used with exactly the same settings that 
> were used to create this calibration scan.
>
> If your color casts are not predictable (e.g. they depend on how long 
> the scanner's lamp has been on), an ICC profile will not help (you 
> could e.g. create one for "lamp was 5 minutes on", "lamp was 10 
> minutes on", "lamp was 15 minutes on", ... and use the appropriate 
> profile, but this would be really stretching it).
>
> Karl Heinz
>
>
> On Jul 3, 2004, at 3:42 AM, Peter Mark Guevarra wrote:
>
>> Hello,
>>
>> I'm quite confused with the use of the ICC profile.  Is it really 
>> intended for the color correction of the image?  For example, when 
>> you scan a yellow image and the output seems to be orange, can the 
>> ICC profile correct this one?
>>
>> Also, how can you post a reply in this forum so that it will fall 
>> under the same topic
>> coz when I reply it always ends up being listed as if it is a new 
>> topic.  Sorry about this =)
>>
>> Thanks,
>> Peter
>>
>>
>>
>> 		
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>