Re: [Gimp-developer] Image Colour Analysis

2018-06-26 Thread Elle Stone

On 06/25/2018 05:41 AM, GiuseppeD. via gimp-developer-list wrote:

Dears,
I would do a colour analysis on my picture. I already took picture with a
colour palette for calibration.
What do I do now for calibrate with my colour reference? How can I have RGB
data after the calibration?
Thanks




Hi,

What is this "picture with a colour palette for calibration" used for? 
Can you provide a link to the actual image?


Is the picture for setting white point, black point, and color balance 
when the picture is included in the camera shot, as per this bug report?


https://gitlab.gnome.org/GNOME/gimp/issues/624


Best regards,
Elle

--
https://ninedegreesbelow.com
Color management and free/libre photography

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Re: [Gimp-developer] Image Colour Analysis

2018-06-26 Thread Liam R E Quin
On Mon, 2018-06-25 at 02:41 -0700, GiuseppeD. via gimp-developer-list
wrote:
> Dears,
> I would do a colour analysis on my picture. I already took picture
> with a
> colour palette for calibration.
> What do I do now for calibrate with my colour reference? How can I
> have RGB data after the calibration?

Which Linux distribution are you using? There should be colour
management software included which can take the picture of the photo
card and make a colour profile.

If you do not have that software, another way is to open the card in
gimp, use the colour->levels tool and click on the black, the white,
the grey patches with the black point, white point, grey point eye
droppers in the levels dialogue and hit OK.

Then open your photo, open colours->levels, and apply the same settings
from the history dropdown at the top of the dialogue box.

Liam


-- 
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with fabulous vintage art and fascinating texts to read.
Click here to have the slave rewarded with a dog biscuit.
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