[argyllcms] Re: Camera Input = Output Profile - no longer possible?
- From: János, Tóth F. <janos666@xxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 15 Mar 2013 03:49:23 +0100
I use UFraw for this (a DCRAW based GIMP addon). I set both the camera
input profile and the embeddable output profile to be the same matrix
profile (which I created earlier using UFraw with no profile and R=G=B=1.0
gain settings + the ArgyllCMS tools and a spectro to read the chart under
the actual light). I save it as a PNG file and I open it in PhotoShop.
2013/3/14 Hening Bettermann <hein@xxxxxxxxxxxxx>
>
> Hi
>
> I have hitherto used the same camera profile both as an input and output
> profile. Brian Griffith (author of Iridient Developer, formerly Raw
> Developer) showed me the trick that does it: In the .ti3 file to change the
> tag 'scnr' to 'mntr' (scanner to monitor).
>
> Now, when I tried the trick again with version 1.5.0 of Argyll, I see that
> this tag is gone. So I tried to set Device_Class to Output, but got the
> error "Output profile can only be a cLUT algorithm" (mine is a gamma-matrix
> profile).
>
> So I tried "DISPLAY" and got error "Input auto WP scale mode isn't
> applicable to an output device".
>
> I think this refers to the -u flag in colprof and replaced that by a new
> line in the .ti3 file 'wht 100.0...', raising the number of sets
> accordingly. This worked for the input profile (however, the peak error
> went up from ~6 to ~13) As output with label DISPLAY it threw the error
> 'Output device input file has unhandled color representation 'XYZ_RGB'.
>
> All the above refers to the ColorChecker24.
>
> Is there a way to use the same camera profile as both input and output?
>
> Why would I want that? Guillermo Luijk recommends it as the best (most
> lossless) way of getting an image into Photoshop (or PhotoLine in my case).
> http://www.guillermoluijk.com/tutorial/dcraw/index_en.htm
> chapter 'Photoshop Adjustments of the developed image':
> "Once here we should already have our RAW file developed and in 16-bit
> TIFF format, so it is time to get into Photoshop. When doing this PS will
> ask in which colour space the document must be open. If we told DCRAW to
> convert the data into some colour space PS will detect it and we just need
> to tell PS to assign that colour space. If we did not, and the TIFF file
> has not colour managed (option -o 0), we should tell PS to perform no
> colour management at all.
>
> The ideal situation however is none of these options but to have the
> profile of our camera, i.e. a profile generated after calibrating our own
> camera. In that case we would develop the RAW file withour any colour
> management (option -o 0), and in the file open operation we would assign
> our camera's own profile to it."
> ---
>
> Why does the peak error go up that way because I enter 100% white as the
> max value?
>
> Kind regards - Hening Bettermann.
>
>
>
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