Re : converting black and white to false color map

[shredderofmass]

I have 16 bit images of a diffration pattern and I want to convert them to a false color image like 'Matlab Color Map' so I can make a false color avi. Does anyone have a quickey routine written for that? Does this already exist somewhere in Imaq and I missed it?

[jc.benoit]

Hi,

Have you tried using the "Color Palette" input of the "IMAQ Windraw.vi" (external display palette) ?

Or with the "Palette=>User Palette" property of the "Vision Image Display" control ?

If your image has 10-bit bitdepth, passI's  an array of RGB values with 1024 entries.

It's been a long time i haven't used this feature, so i am not sure it will work with 16-bit image, but give it a try.

Best Regards.

JC Benoit

Vision Engineer

Alliance Vision

www.alliancevision.com

[shredderofmass]

I'll look at windraw, but the obhject us to save the image as a false color map similar to the matlab function. Simply displaying it with the display palette is not enough.

[shredderofmass]

OK, it appears this might work, sort of. The color map 'rainbow' is acceptpable but I don't really like the color scheme. I would prefer the color map as follows;

1) No light would be black,

2) little bit of light transitions to red

3) At the top end, getting hot would be blue,

5) The max intensity would be white.

[jc.benoit]

You should also be able to specify a custom palette, simply input your custom array of RGB clusters to "IMAQ Windraw.vi".

You can also input a custom color map to the "IMAQ Write File.vi", if you need to record the images to the hard disk.

Best Regards.

JC Benoit

Vision Engineer

Alliance Vision

www.alliancevision.com

[shredderofmass]

Actually I take it back. It doesnt seem to work at all. I need to be able to save the false color image. False color images are invaluable in scientific image processing.

[BruceAmmons]

It sounds like the "gradient" palette might work for you.  I think it goes black -> red -> blue -> white (with a few colors in between).

I would use the color palette as a lookup table to convert your grayscale image to a color one.  I am sure there is a way to do it, but I haven't ever tried.

Bruce

[shredderofmass]

I solved it. Pretty easy actually.

[BruceAmmons]

Looks like it works, but it is a bit complicated.  I was thinking something a little simpler, like this:

This just converts the palette to color lookup tables and uses the color lookup vi to convert the image.

Bruce

[slovintern]

Hello,
I need to use this for a black and white luninacne graph. is there a way to display a scale as well to show which colour means how much,