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Thread: Help with The Knife?

  1. #1
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    Help with The Knife?

    Okay,
    I'm getting increasingly frustrated at this..
    can someone tell me why does the palette knife peel paint off on some occasions and not peel and in fact 'thicken' the paint on others..
    I've had this happen at different places on the canvas in a single stroke...

    The thing is I love both behaviors..
    it's just that I can't seem to figure the logic out how to control them.
    I've tried all the on screen knobs max-min
    I've tried full pressure on the stylus to barely touching the surface
    I've tried putting the grain max-min

    I just can't figure it out.

    Please HELP!!!

    thanks,
    Fly.
    P.S. I'm attaching an image where you can see both the results..
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    The more hair I lose, the more head I get.

  2. #2
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    I'm guessing it's a factor of ...wait, which knife are you using?

    Whichever it is, it's only pushing pixels, so if it's on the edge, it's going to be diffusing/pushing and not replacing

    If it's in the centre and you hit a thick bit of paint, or a darker patch, the entire are will be homogenised...

  3. #3
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    The entire area certainly shouldn't be homogenised, we're tracking more than just pixel colours here, we're moving volume data around on a surface. The knife tracks both the colour of your paint (including reflectivity settings for metallicity) and the volume of paint on the canvas.

    If there is a blob of paint it will smear that paint out, reducing the volume at the current point and spreading it along the path of the knife, thinning as it goes until it runs out.

    If there is no 'volume' then the palette knife does a sort of smudge, so you get the colour fading as it moves.

    If you move the palette knife over an area that has some thick paint and some thin then it tracks both areas, so you get a variable smear/smudge.

    Basically, if you think of it as a knife 'smooshing' paint the pattern should be clearer. If there's paint to smoosh, it'll spread and flatten out. If there isn't any then it will smudge the colour but won't spread it around.

    I've attached an image example. Two spots of paint, one with the tube (so there's lots of paint on the canvas) and one with the oil brush run with moderate thinners. On the right hand side of the example I did a single palette knife that crossed downward over both spots at the same time. Note that the right hand of the stroke runs of out paint earlier than the left, because there is less paint volume to smear on the right hand. So a single stroke can produce variable results based on what volume is on the canvas under it.
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    Matt
    ArtRage UI
    Ambient Design.

  4. #4
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    Sorry, I knew that ^_^
    By homogenised, I meant... 'that result you are getting but it's 2am so I can't be bothered writing it all out'


    But volume data, yes, that's what I was trying to think of.

  5. #5
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    Thanks MattRage & Flynn_the_cat.

    That makes sense. I also put a single blob in the center of a blank canvas and managed to cover the entire canvas with smooshed thick paint using only the knife. Quite cool.

    This opens up another question, is there a way to determine the thickness/thinness of paint? (The light effect F5) shows the biggest and the boldest of the strokes, but I'm talking about the not so obvious volume of paint, which nears the threshold below which the knife will scrape the paint?
    Thanks
    The more hair I lose, the more head I get.

  6. #6
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    Well, you can alter the loading and thinners... ^_^

  7. #7
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    Oh I meant to say to see the volume of paint that's been applied.
    Anyway I figured out another thing..
    More the paint on the canvas better everything woks, knife blending, brush blending etc.
    So I just tried to put gobs and gobs of paint before picking up the knife and it seemed to work much much better. No scraping at all.
    Here's an image I did based on a tut on deviant art.. it's still quite raw but I'm sort of happy with the blending. I think I'm getting the handle on it...
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    The more hair I lose, the more head I get.

  8. #8
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    that's a great one, wow!
    Why not make a step by step of this ? it is really great.
    Just say: "Rage It", because we already know it's art.

    My ArtRage 3 and 4 Gallery------My Site ------- BROWSE MY BOOK

  9. #9
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    Actually the original step-by-step is by ales-kotnik on deviantart.he's got the best rendition of quick 'steel' I've seen.
    here's the link:
    http://ales-kotnik.deviantart.com/gallery/#Step-By-Step
    The more hair I lose, the more head I get.

  10. #10
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    That came out really well, looking great!
    Dave
    Resident Bug-Hunter
    Ambient Design

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