Multiplying pixel values by a function??

jcely wrote on Oct 13, 2009

I'm working on images of a diffuse, expanding nebule (eta car). And my prof wants me to mask out parts of the image so only certain parts are used in a cross correlation to align images.

It seems like a pretty simple idea, but i don't know how to read in pixels and based on their x,y coordinates, multiply it by a function. I'm trying to do this in C++, since i can't find an iraf task to do this, and have the cfitsio.h library but it doesn't seem to have something to read pixel values.

thanks for your help.
Justin

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Mike Fitzpatrick wrote on Oct 13, 2009

See the IMEXPR task help page. You can create an expression that uses the pixel position in some way, and you can create a pixel mask by specifying the output image as a .pl file. You might also use the REFERENCES task to search for other mask-making tasks e.g. text2mask, mskexpr, etc.

-Mike

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jcely wrote on Oct 13, 2009

thanks that was perfect!

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Last post on Oct 13, 2009