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03/31/2004 07:48:07 PM · #1 |
Is there a Paintshop Pro 7 (or free downloadable program) technique that allows you to apply an effect that does something like this:
- You define a gradient of colours, e.g. black -> violet -> blue -> ... -> red -> white.
- You tell the program something like "Lose the lightness value of all pixels and make them one of the colours on that gradient. Whatever the lightness of the pixel WAS corresponds to the new colour. E.g. pure white -> white. Light grey -> red. Dark grey -> blue/violet.
The overall effect should look slightly like a picture from a thermal imaging camera (not the same thing, of course). I thought it might be kind of fun to experiment with. Any easy method of doing that which does ot involve a lot of work and brain power? It's sooo late at night and I'm looking for excuses not to do my work.
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03/31/2004 07:56:41 PM · #2 |
| My favorite way to mess with colors like that is to use Curves; if you use separate ones for each color channel, and experiment with dragging different parts of the curve to extremes in all directions you can get some interesting effects. Curves map specified input values to corresponding (adjusted) output values, and usually comes free with every program. |
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03/31/2004 08:26:54 PM · #3 |
I like V or U shaped curves in the RGB channels - gives a semi-solarised/ sabbatier effect
Details in the details.
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03/31/2004 08:33:28 PM · #4 |
I'll try that tomorrow (I guess I mean today) when I feel more awake. Oh my god, it's half past two already.
I like your star, by the way.
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03/31/2004 08:37:35 PM · #5 |
| Does anyone know if there's a curves adjustment in PSE? |
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03/31/2004 08:45:43 PM · #6 |
Originally posted by Marjo:
Does anyone know if there's a curves adjustment in PSE? |
No -- that and the ability to convert to CMYK (for offset pritning) are the major limitations vs. Photoshop! You can do somewhat the same thing (but with far less control) using Levels. Try using several adjustment layers to "stack" the effects. |
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03/31/2004 08:49:42 PM · #7 |
You can also achieve interesting effects by using the curves available in Photoshop's Duotone mode. The folowing was "colorized" from a grayscale image using Black, Cyan, and Yellow in a tri-tone:
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03/31/2004 11:28:32 PM · #8 |
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04/01/2004 12:04:48 AM · #9 |
| Photoshop Elements doesn't have Curves, but it does have Gradient Map, which can also create some interesting effects. This is what Squirrel was wanting in Paint Shop Pro (which doesn't have it). |
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04/01/2004 12:34:42 AM · #10 |
To obtain the "true" thermal scan look you really need the prime colors of Hue weel. That means the following (in PainShop Pro):
1. Split image to HSL
2. Your Lightness is what you want to use as Hue map.
3. To obtain only 'prime' rainbow colors you need L=50% S=100%. For that we can use Saturation image - clear it with pure white, and Hue image - clear it with 50% grey.
4. Combine from HSL use Lightness as Hue value, Hue as L, S as S.
You will get something like this:
Piece o'cake!
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04/01/2004 12:45:16 AM · #11 |
Just thought about this: I don't know how to spin the Hue wheel with b/w map. This actually requires cyclic color change like index shift in the pallette. I can edit the greyscale pallette - shifting the indices as needed to obtain 'proper' maping of lightness values to Hue colors. As described above the mapping is: from the darkest to the lightest - smooth gradent through red-orange-yellow-green-cyan-blue-magenta-red.
To stop the lightest at magenta you will probably need to adjust the output levels of the lightness image to the value of 223 or close to that.
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04/01/2004 11:52:40 AM · #12 |
Dibutil, that is very impressive! Thank you very much for that method.
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04/08/2004 10:01:02 AM · #13 |
I just found the "gradient map" in Photoshop - does exactly the same thing - assigns editabe color gradient to the luminance map of the image. PS rulez!
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