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Thread: Knife darkening paint

  1. #1
    Join Date
    Jan 2011
    Posts
    11

    Knife darkening paint

    While mixing paint on canvas, blending values, i observed a frustrating thing: dark paint seems to be picked up from everywhere, but "light paint" is hard to pull over dark areas. I found myself adding and adding "light paint" and blending till i realized it ain't getting any brighter...

  2. #2
    Join Date
    Mar 2006
    Location
    Ambient Design
    Posts
    3,502
    Hi there,

    Could you please post a screenshot which illustrates the problem you're describing, as well as letting us know the tools and settings used to place the paint down and to blend? When we've seen an example and have a little more information, we can take at this for you.
    Dave
    Resident Bug-Hunter
    Ambient Design

  3. #3
    Join Date
    Jan 2011
    Posts
    11
    Hi!

    The specific tool i was using is the sticker spray, using a custom brush, and the flat knife tool, i believe the "hard out smudge" preset. It is hard to pick up the effect on a screenshot as it is subtle in actual use, hence it took me some time to realize what was going on. So instead i try to demonstrate the effect with clean black and white stencil fills.
    On the left patch i used "tendrils" stencil on a fill white patch, and filled it with black. On the sides of this patch are other methods off blending for comparison. I admit the white part is intensive on this patch as well as the black, what i did not observe before.
    On the upper right patch i filled two rectangular selections with black and white, then i placed a stencil on top and set it to guide mode so i can test the knife tool with pulls exactly on the border line. And the black paint made its way further and further into the white. The blending of the two paint in such case is expected in real life, but the blending should be more even on both side.
    On the bottom right patch, i filled checkerboard stencil with black on top of a white patch. Then i used the flat knife (with hard out smudge preset again) on elliptical selections. The more i blended with the knife the darker the results became. For a test i also included a part on this patch with "hard wet blender" preset which turned out a tad bit lighter than middle gray but it reached a balance at this value and not continued to get lighter or darker.

    As i see if there is no black in what we mix together, the mixing does not go darker and darker till it gets black, but to perhaps to the darkest starting value what existed before we started to mix.
    Also its only the flat knife, which i observed this behavior.

    Hope you can understand what i try to say, because i learned the language on my own...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by tuszek; 05-13-2011 at 03:35 AM.

  4. #4
    Join Date
    Jan 2011
    Posts
    11
    Do you have any news on the matter?

  5. #5
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    3,133
    Looking at the image, and trying it out here I think I can see what's happening.

    The blending code can sometimes tend colours towards darker tones and I think that's what's happening here. The 'creep' of black in to white happens because paint over the area of the brush head is darkening from the center out.

    The checkerboard is harder to use for testing because more black and white will tend to be pulled in from the surrounding squares, but the vertical line example illustrates it well.

    We have addressed this in our current test code however and when our next update is released you should see a significant improvement. Thanks for the information, it's always good to get precise examples so we can track these things down.
    Matt
    ArtRage UI
    Ambient Design.

  6. #6
    Join Date
    Jan 2011
    Posts
    11
    This is good news, i look forward to the new release. Thank you!

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