rainbow color table flatten to pixmap

[juanni]

I want to use the labview flatten to pixmap to make a jpeg file out of a 16 bit greyscale.  Labview makes lovely images from my data with the "rainbow" color table.  I can't find the rainbow color table anywhere on the forum and would spend many hours trying to make it myself.  I have a "rainbow banded" table that I found here on the forum, but it just doesn't do the image justice.  Can someone help me out with the plain old rainbow color table?  J (using labview 11.0)

[_Tim]

Where did you find this rainbow color table? How does it differ from a standard RGB color table?

[juanni]

This post contains some color tables in one of the attached vi's:

http://forums.ni.com/t5/LabVIEW/Standard-color-table-for-intensity-graph/m-p/1143901/highlight/true#...

[_Tim]

Hey, thanks for the link to that forum.

I was looking through the bitmap file containing rainbow banded and noticed there is also a rainbow striped gradient. Am I right in assuming this is the type of thing you're looking for?

[juanni]

Both of those (rainbow banded and rainbow striped) put in some greyscale banding that I don't want in my images.  Blechers.  I am new to image considerations, so this is driving me nuts.  Also, I seem to lose resolution in going from the labview picture displays to jpegs... is it really just a problem of bit depth?  J

[_Tim]

Have you tried using your own color gradient with the VI attached to the other forum? There are plenty of rgb color gradients floating around online; Googling 'rgb gradient' returns plenty of examples, such as the one attached below.

[juanni]

I cannot open that .bmp file.  Apparently, I don't understand what a .bmp file is.  Obviously, that file .bmp file opens fine via the labview vi, but I don't understand how to generate (or find, though I obviously understand how to google something) a .bmp file from the pretty jpegs that the google search returns.  Obviously, I am starting from a serious knowledge deficit when it comes to images.  J

[_Tim]

Are you saying you’re having trouble opening the .bmp file in LabVIEW, or just opening it in general?

If you just need to change the file extension, a jpeg can be resaved as a .bmp using a variety of programs such as Microsoft Paint, though the quality of that new image will vary. Depending on the nature of your application and the quality of the original image, this may or may not be an issue.