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Thread: Do you know a paint app with good colour adjustment utilities?

  1. #1
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    Do you know a paint app with good colour adjustment utilities?

    Hi,

    First of all: if you are reading this the chances are you have struggled with colour adjustment at some point. Please tell me about it even if you are not certain it would help me.

    I've been using a lot of ink trying to get the colours of a picture the way I would want them to be. There is a HUGE difference between the colours displayed on the screen and the colours of the printed page. In KolourPaint I have in "Balance": Brightness, Contrast and Gamma. This can be applied to all channels or to one of the channels: Red, Green, Blue. There is also "Hue, Saturation, Value". But it is very hard for me to guess what the effect of any change will be once printed out.

    I cannot do much with my printer, but maybe there is some program out there which I could tune to get "True Colors" the way we have "True Type" (the printer knows the displayed fonts)? I imagine something where I would start by printing out some colour palette, then put the paper next to the screen and tune the display until the colours on the screen exactly match the colours on the paper. If you have ever heard about such utility, please tell me about it.

    Another question, is there any paint program which allows the user to tune colours as if they were real paint? I mean, blue + yellow = green, etc. I find this RGB stuff completely counter-intuitive. I would also need some kind of slider "Bright colours" <----------> "Pastel colours".

    All suggestions welcome
    Last edited by Mariane; May 21st, 2013 at 05:24 PM. Reason: more precise
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

  2. #2
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    Re: Do you know a paint app with good colour adjustment utilities?

    Although I have never done it, I guess that you would have to calibrate your screen first.
    It could be that the printed colours are correct and your screen is wrong.
    Search for "colorimeter".

    Also, how many ink cartridges does your printer have? If less than six you probably need a new printer.
    You can reduce your ink costs by searching for "CISS" and the model of your printer.
    I had the tank and flexible pipe system for several years, it worked great but makes moving the printer difficult.
    http://www.ebay.co.uk/itm/CISS-SYSTE...item3379722774

    Now I use re-fillable cartridges similar to this.
    http://www.ebay.co.uk/itm/REFILLABLE...item3377e383e7

  3. #3
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    Re: Do you know a paint app with good colour adjustment utilities?

    Thank you. Maybe I need a new printer, mine has 4 cartriges (black, purple, blue and yellow).

    It looks like a colorimeter is a physical object you have to buy (eg colorhug):
    http://www.hughski.com/
    http://ubuntuforums.org/showthread.p...light=colorhug

    I don't have one but I will keep this option in mind.
    Last edited by Mariane; May 21st, 2013 at 06:09 PM.
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

  4. #4
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    Re: Do you know a paint app with good colour adjustment utilities?

    Hay,

    Your issue is NOT your screen.

    Sigh.. It is also not "black, purple, blue and yellow". It is Cyan, Magenta, yellow and black.

    See here for details as to why RGB images and CMY printers have issues.

    http://photoshop4artists.blogspot.co...lor-space.html
    http://www.cruxcreative.com/rgb-vs-c...which-and-why/
    http://marvin.mrtoads.com/rgb_vs_cmyk.html

    Once you have read all the above... You shall be enlightened.

    Then next up you will want to know: "So how to convert RGB images to CMYK format".
    See here for a rather amusing, but still informative, discussion on the matter:
    http://ubuntuforums.org/showthread.php?t=2138517

    Hope this clears (pun intended on that ) things up haha.

    Cheers
    Switched away from windows XP to Ubuntu 9.04. Never turned around to look back.

  5. #5
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    Re: Do you know a paint app with good colour adjustment utilities?

    You certainly didn't lie, these links did enlight me!

    So now it looks as though I will have to use gimp or imagemagick to convert my files from RGB to CMYK and then try to readjust the colours in CMYK format before printing. I'll post again, either to give hints to the next person or because I got stuck. Which is more likely is anybody's guess.
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

  6. #6
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    Re: Do you know a paint app with good colour adjustment utilities?

    I bow to zero2xiii's superior knowledge

  7. #7
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    Re: Do you know a paint app with good colour adjustment utilities?

    Quote Originally Posted by coldraven View Post
    I bow to zero2xiii's superior knowledge


    Please there is no need haha.. I just had to share that info since it is such a common mistake. Who knows WHY printer and software manufacturers never sat down and decided on a standard. Coming from a production company's point of view (stage and theater) the issue even deepens when using RGB lighting, with cameras, and then trying to convert and print in CMYK. A true nightmare! haha.


    @Mariane glad I could help, and good luck with your journey, this is one thing GIMP, even 2.8, still lacks in and that is proper support for both color spaces...

    Cheers
    Switched away from windows XP to Ubuntu 9.04. Never turned around to look back.

  8. #8
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    Re: Do you know a paint app with good colour adjustment utilities?

    I already had Gimp, so I started with:
    Code:
    sudo apt-get install gimp-plugin-registry
    sudo apt-get install icc-profiles
    In Gimp: "Image/Separate/Separate" offered me many baffling options. Which is the source colour space? I picked the first one on the list, sRGB. I ticked "preserve pure black", because this was something I could understand and it sounded desirable. Some copy appeared, which looked like my image in black and white and inverted. If I had not read that:
    http://askubuntu.com/questions/11485...o-cmyk-in-gimp
    I would have closed this horror on sight.

    In "Image/Separate/Export" I chose the default CMYK profile, saved under a new name, and hopefully opened back in KolourPaint. The printout was much paler than before, the colours were still off, only in a different way. After some mods I saved, I tried opening it back in Gimp. Gimp did not even see the file, and unlike KolourPaint it does not have a text field in the "open file" window where you can type the name. I tried closing Gimp and re-opening it, hoping it would refresh its file list. I didn't. So I found the file with Konqueror and did "Open with/Gimp". This worked but... Big deception! The file is back in RGB, one layer.

    Now I'll try again, and this time I'll try to export it layer by layer, hoping to get 4 files with adequate transparency, so that if I manually superimpose them I'll get my original picture back.
    Last edited by Mariane; May 22nd, 2013 at 10:55 AM.
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

  9. #9
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    Re: Do you know a paint app with good colour adjustment utilities?

    Image/Properties says "Colour space = greyscale". Print preview displays something very similar to what is displayed on the screen, a nearly black picture.
    I tried Image/Export and reopening. Now I have something which says it is in greyscale, 5 layers. Looks like I'll soon reach 50 shades of grey... Why am I in greyscale, what did I do wrong?
    Last edited by Mariane; May 22nd, 2013 at 11:10 AM.
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

  10. #10
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    Re: Do you know a paint app with good colour adjustment utilities?

    Following advice here: https://wiki.archlinux.org/index.php...color_and_Gimp

    I got:
    http://download.adobe.com/pub/adobe/...CCProfiles.zip
    http://www.blackfiveservices.co.uk/l...3_linux.tar.gz
    From: https://aur.archlinux.org/packages.p...ils=1&ID=11438

    In uncompressed separate-gimp2-0.3_linux, there is a Makefile but no configure. Typing "make" says "nothing to be done for 'all'". It needs to be compiled with makepkg, which is not Ubuntu. I looked at the Makefile, you apparently need gccmakedep, and in the source code there is no main function, only a gtk_main ().

    Code:
    make install
    Said:
    gimptool-2.0 --install-bin separate
    make: gimptool-2.0: Command not found

    Code:
    sudo apt-cache search gimptool
    Said:
    libgimp2.0-dev - Headers and other files for compiling plugins for GIMP

    Code:
    sudo apt-get install libgimp2.0-dev
    make install
    Said:
    gimptool-2.0 --install-bin separate
    cp separate /home/kub/.gimp-2.6/plug-ins

    Code:
    gcc separate.c
    Said: "separate.c:25:21: fatal error: gtk/gtk.h: No such file or directory"

    In other words, this command returns "Forget it". ArchLinux stuff, not Ubuntu. I could get this lib, then it would miss other dependencies, which I also could get, etc. A very good way of going nowhere. I've been there, tried it, bought the T-shirt...

    In subdirectory sRGB there is a file called sRGB Color Space Profile.icm which might be useful. In (uncompressed) Adobe ICC Profiles, there are 2 subdirectories called "CMYK Profiles" and "RGB Profiles". Both contain several .icc files. If I listed them here it would sound as a bad case of calligraphical hiccups. They might be useful, though.
    Last edited by Mariane; May 22nd, 2013 at 12:21 PM.
    The result of the "make" command:
    - Sitting bored in front of a computer
    - Watching abstruse output scrolling upwards too fast to be read
    - And waiting for something to go wrong

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