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Transparent series of images with axis using cgImage [message #88115]

Fri, 21 March 2014 06:01

Petros Syntelis
Messages: 32
Registered: June 2013

Member

Hi everybody,

I am trying create three images with axis in a row, and overplot above them a transparent image.
I have a code like this that works fine in the 'X' window case

cgimage, im1 , xr=[..],yr=[..],/axis, /keep ,pos=pos
loadct,3
cgimage, im2 , xr=[..],yr=[..],/axis, /axis, transparent=transparent, /over,pos=pos
...
and is followed by two other similar sets of plots with different position vectors.

When i want to print this to ps. according to the instructions here
https://www.idlcoyote.com/ip_tips/transparentpng.php
, I have to provide a background image.

Now, if i do the trick described in the documentation, and write the code as

cgDisplay, /Pixmap
cgimage, im1 , xr=[..],yr=[..],/axis, /keep ,pos=pos
bgimage1 = cgSnapshot()
WDelete
...

for all three cases, and pass the bgimages to AlphaBackgroundImage, like

cgps_open ...
cgimage, im1 , xr=[..],yr=[..],/axis, /keep ,pos=pos
loadct,3
cgimage, im2 , xr=[..],yr=[..],/axis, /axis, transparent=transparent, /over,pos=pos, AlphaBackgroundImage=bgimage1
...
cgps_close

I have the following problems:
a) The background images does not match the size of the transparent images in the ps file.
b) The characters in the axis are different
which both of them arise i think from the fact that the window size does not match the ps window file.

Has anybody tried to create transparent images with axis and done it correctly?

Regards,
Petros

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[Message index]

		Transparent series of images with axis using cgImage By: Petros Syntelis on Fri, 21 March 2014 06:01
		Re: Transparent series of images with axis using cgImage By: Petros Syntelis on Fri, 21 March 2014 06:07
		Re: Transparent series of images with axis using cgImage By: David Fanning on Fri, 21 March 2014 07:41
		Re: Transparent series of images with axis using cgImage By: Petros Syntelis on Fri, 21 March 2014 09:41

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