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#1 Posted : Tuesday, June 16, 2009 10:16:05 AM(UTC)


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Photoshop has a color pallet function that will take a grayscale image and map the pixel values to a color pallet consisting of black, red, and yellow.  Essentially blacks stay black, but as the pixel values get "brighter" they turn into red and finally yellow/almost-white.  Here is an example of it being used:  http://www.moesrealm.com/photoshop/flaming.html.

I am building an image processing application for x-ray images and our customer has required us to include this feature.  Starting with a grayscale RasterImage, can someone please suggest the process by which I could reproduce this effect in Leadtools?

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#2 Posted : Wednesday, June 17, 2009 6:20:52 AM(UTC)
Maen Hasan

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If the image is 8 bits per pixel or less, you can directly manipulate the palette entries to convert the gray shades to color.

For example, the following code converts gray shades to red shades:
if (rasterImageViewer1.Image.BitsPerPixel > 8)
    MessageBox.Show("Palettes only exist in 8-bit or less images");
Leadtools.RasterColor[] p = rasterImageViewer1.Image.GetPalette();
for (int i = 0; i < p.Length; ++i)
    if (i < 128)
        p[i] = new RasterColor(i * 2, 0, 0);
        p[i] = new RasterColor(255, (i - 128) * 2, (i - 128) * 2);
rasterImageViewer1.Image.SetPalette(p, 0, p.Length);

You can choose a range of the palette to modify, and you can also use a different algorithm to do the mapping.

For other types of gray images (extended grayscale such as 12-bit and 16-bit), there is no palette, but there is a similar concept called lookup table and Window Leveling.

Maen Badwan
LEADTOOLS Technical Support
#3 Posted : Thursday, September 30, 2010 10:32:14 PM(UTC)

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Posts: 53

Hi Badwan

Can i get the range of other peletts like
1. blackbody(given by you)
2. Cardiac
3. Fiveramp
4. Flow
5. Fusion16
6. GE_Color
7. GrayRain
8. Hotiron
9. NIH
10. Spectrum
11. Slope.

Waiting for your reply.

#4 Posted : Saturday, October 2, 2010 11:13:08 PM(UTC)
Maen Hasan

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Posts: 1,326

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You should be able to implement any algorithm you want for changing the palette entries. However, since I don't have the details of these algorithms, I'm afraid it will be up to you to do the implementation details for these algorithms.

Maen Badwan
LEADTOOLS Technical Support
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