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Re: joining images into a colored one [message #94510 is a reply to message #94509]

Thu, 15 June 2017 04:55

markb77
Messages: 217
Registered: July 2006

Senior Member

Not sure this is exactly what you're asking for, but it is along the same lines. I typically deal with an arbitrary number of greyscale images which I want to combine into a multicolor image. What I do is render each greyscale image as an RGB image with a certain colormap. Once you have a set of RGB images, they can simply be added together to produce the final image.

Something like the code below. Note that each greyscale image is contained in an IDLgrImage object which have all been added to the same IDLgrView, and each has its own IDLgrPalette which sets the color of each channel. All of the images are hidden, and what I do is unhide them one at a time, saving an RGB image each time. At the end the RGB images are added up to form the final image.

=====================

output_image = intarr(3,xpix,ypix)

for i = 0, number_of_input_images-1 do begin

image_object_array[i] -> SetProperty, HIDE=0
image_buffer_object -> Draw, view_object
image_buffer_object -> GetProperty, image_data = rgb_image
image_object_array[i] -> SetProperty, HIDE=1

output_image = ( temporary(output_image) + rgb_image ) < 255

endfor

output_image = byte(temporary(output_image))
output_image = reform(output_image, 3, xpix, ypix, /overwrite)

return, output_image

=========================

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[Message index]

		joining images into a colored one By: Helder Marchetto on Thu, 15 June 2017 04:18
		Re: joining images into a colored one By: markb77 on Thu, 15 June 2017 04:55
		Re: joining images into a colored one By: Helder Marchetto on Fri, 16 June 2017 03:18
		Re: joining images into a colored one By: Guilherme Gualda on Sun, 18 June 2017 20:50

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