Comments for Technical Blog of Richard Hughes

Comment on GNOME Color Manager and initial scanner support by Nicolas Mailhot

Nicolas Mailhot — Fri, 06 Nov 2009 12:55:00 +0000

For video getting gamma and grayscale balance right is much more important than just calibrating colours, as videos are viewed from a distance, and rarely in a completely dark room.

Good video calibration will have you fix a lot more things than static images (and beamers have more controls than the average computer screen)

Comment on GNOME Color Manager and initial scanner support by hughsie

hughsie — Fri, 06 Nov 2009 11:28:47 +0000

Sure, but be careful of policies. As I’ve found with gnome-power-manager, it’s a usability nightmare to have to go to a control panel, change the mode, do something, go to a control panel, change the mode back. Ideally the application can do the heavy work, and choose a profile for a device based on a per-application preference, or using some sort of metric.

I also don’t think it’s a very important problem, as 99.999% of people using Linux right now are not aware of what colour management is, let alone calibrated their hardware for the correct colours. I think it’s more important to get 90% of people using colour profiles by default, and then work with the 0.0001% of people that need to do the really advanced stuff.

But then I’m a GNOME developer, not a KDE developer, so I would say that…

Comment on GNOME Color Manager and initial scanner support by prokoudine

prokoudine — Fri, 06 Nov 2009 10:10:17 +0000

This is why Kai-Uwe and me were talking about Oyranos and policy based application of profiles

Comment on GNOME Color Manager and initial scanner support by hughsie

hughsie — Thu, 05 Nov 2009 22:33:09 +0000

Sure, video calibration (from a colour point of view) isn’t a lot harder than static images. I would expect that if the projector is supported using DVI or HDMI, then things could be calibrated as if it’s a giant screen, if you have the right hardware.

Comment on GNOME Color Manager and initial scanner support by hughsie

hughsie — Thu, 05 Nov 2009 22:29:59 +0000

Yes, we need different profiles for cameras too, so for instance there might be a “in the lab” profile and an “outside full sunlight” profile. I’m not sure on the interface to make this possible just yet, but I’m aware of the problem as a consideration.

Comment on GNOME Color Manager and initial scanner support by Jazbo

Jazbo — Thu, 05 Nov 2009 21:07:39 +0000

This is very interesting, will it be possilbe to manually adjust a printers color settings? More specifically, take some yellow out of an HP B9100? At this point that is the only thing that is keeping me having a dual boot…

Comment on GNOME Color Manager and initial scanner support by Nicolas Mailhot

Nicolas Mailhot — Thu, 05 Nov 2009 20:01:24 +0000

It would be very nice if you also addressed video calibration. The reference software for that is here (sadly, written for the wrong platform). It was created by the French A/V community for the French A/V community (a sizable part of which earns its life selling expensive A/V kit or even calibrating it for people wealthy enough to afford it)

http://www.homecinema-fr.com/colorimetre/index_en.php

If you can find someone to translate it to you the tutorial it is very good and explains the steps needed to calibrate a screen or beamer for video (they’re probably more appropriate than photo calibration for most people. Video people know the average screen is not perfect, since it’s much more expensive to get a perfect video screen of suitable size, while photo people tend to assume a perfect computer screen is possible)

Those guys also designed the only home-made colorimeter argyllcms supports, BTW.

Comment on GNOME Color Manager and initial scanner support by Daniel Berrange

Daniel Berrange — Thu, 05 Nov 2009 18:40:48 +0000

When associating profiles with scanners, you’ll need to allow for multiple profiles to be associated with each scanner for the different modes of scanning, eg reflective media vs transparencies, or even for the types of media – eg different types of positive slide film, or negatives.

Comment on GNOME Color Manager and initial scanner support by Jon Pritchard

Jon Pritchard — Thu, 05 Nov 2009 18:08:09 +0000

Looking great, as others have said, rapid development – very impressive. Thanks, can’t wait to try this out.

Comment on GNOME Color Manager and initial scanner support by hughsie

hughsie — Thu, 05 Nov 2009 15:28:10 +0000

Usually, I just copy a project that I know works. For gnome-color-manager I used the gnome-packagekit project, and just stole other bits from gnome-power-manager. Once you’ve created one or two projects from the ground up, another is a piece of cake.