| Displaying Transparent Images [message #73365] |
Fri, 05 November 2010 08:44  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
Jeremy's suggestion the other day about displaying alpha channel
images with TVImage was a good one. It has taken me a week or so
to get all the bugs worked out (lots of code changes!), but I think
I am finally there. I've put up a new version this morning with
another bug fix and some code rearrangement to make the code
easier to maintain. (Amazing how much things can be improved
after you understand what you are doing!)
http://www.dfanning.com/programs/tvimage.pro
Testing this functionality gave me a lot of good ideas for
how it can be used. In fact, I found I *really* had a need
for displaying transparent images yesterday! A transparent
image is one in which a particular color has been knocked
out so you can see the background behind it.
To make this easy to do, I wrote a new program, named
Make_Transparent_Image, last night to create transparent
images either from other images I have laying around
or directly from graphics windows containing plots and
such that I wish to display on other, background images.
(I was fooling around making image mash-ups for book
cover designs.) You can find the program here:
http://www.dfanning.com/programs/make_transparent_image.pro
I have to admit, it's pretty neat. I'm displaying plots
and such with white backgrounds. If I want to create
an image with the white background knocked out, so I
can put the plot on another image, I just do something
like this:
IDL> Histoplot, LoadData(7)
IDL> transparent = Make_Transparent_Image(Color='white')
IDL> LoadCT, 22
IDL> TVImage, Loaddata(7)
IDL> TVImage, transparent, POSITION=[0.5, 0.5, 0.95, 0.95]
Totally cool! :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Displaying Transparent Images [message #73453 is a reply to message #73365] |
Fri, 05 November 2010 12:34  |
Jean[2]
Messages: 41
Registered: October 2010
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Member |
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On Nov 5, 2:41 pm, Jeremy Bailin <astroco...@gmail.com> wrote:
> On Nov 5, 11:44 am, David Fanning <n...@dfanning.com> wrote:
>
>
>
>> Folks,
>
>> Jeremy's suggestion the other day about displaying alpha channel
>> images with TVImage was a good one. It has taken me a week or so
>> to get all the bugs worked out (lots of code changes!), but I think
>> I am finally there. I've put up a new version this morning with
>> another bug fix and some code rearrangement to make the code
>> easier to maintain. (Amazing how much things can be improved
>> after you understand what you are doing!)
>
>> http://www.dfanning.com/programs/tvimage.pro
>
>> Testing this functionality gave me a lot of good ideas for
>> how it can be used. In fact, I found I *really* had a need
>> for displaying transparent images yesterday! A transparent
>> image is one in which a particular color has been knocked
>> out so you can see the background behind it.
>
>> To make this easy to do, I wrote a new program, named
>> Make_Transparent_Image, last night to create transparent
>> images either from other images I have laying around
>> or directly from graphics windows containing plots and
>> such that I wish to display on other, background images.
>> (I was fooling around making image mash-ups for book
>> cover designs.) You can find the program here:
>
>> http://www.dfanning.com/programs/make_transparent_image.pro
>
>> I have to admit, it's pretty neat. I'm displaying plots
>> and such with white backgrounds. If I want to create
>> an image with the white background knocked out, so I
>> can put the plot on another image, I just do something
>> like this:
>
>> IDL> Histoplot, LoadData(7)
>> IDL> transparent = Make_Transparent_Image(Color='white')
>> IDL> LoadCT, 22
>> IDL> TVImage, Loaddata(7)
>> IDL> TVImage, transparent, POSITION=[0.5, 0.5, 0.95, 0.95]
>
>> Totally cool! :-)
>
>> Cheers,
>
>> David
>
>> --
>> David Fanning, Ph.D.
>> Fanning Software Consulting, Inc.
>> Coyote's Guide to IDL Programming:http://www.dfanning.com/
>> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
>
> Thanks again! Very useful stuff. :-)=
>
> -Jeremy.
David,
Are you gonna put this new program in your repository. I found this
coyote repository very convenient to use !
Jean
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| Re: Displaying Transparent Images [message #73458 is a reply to message #73365] |
Fri, 05 November 2010 11:41 |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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On Nov 5, 11:44 am, David Fanning <n...@dfanning.com> wrote:
> Folks,
>
> Jeremy's suggestion the other day about displaying alpha channel
> images with TVImage was a good one. It has taken me a week or so
> to get all the bugs worked out (lots of code changes!), but I think
> I am finally there. I've put up a new version this morning with
> another bug fix and some code rearrangement to make the code
> easier to maintain. (Amazing how much things can be improved
> after you understand what you are doing!)
>
> http://www.dfanning.com/programs/tvimage.pro
>
> Testing this functionality gave me a lot of good ideas for
> how it can be used. In fact, I found I *really* had a need
> for displaying transparent images yesterday! A transparent
> image is one in which a particular color has been knocked
> out so you can see the background behind it.
>
> To make this easy to do, I wrote a new program, named
> Make_Transparent_Image, last night to create transparent
> images either from other images I have laying around
> or directly from graphics windows containing plots and
> such that I wish to display on other, background images.
> (I was fooling around making image mash-ups for book
> cover designs.) You can find the program here:
>
> http://www.dfanning.com/programs/make_transparent_image.pro
>
> I have to admit, it's pretty neat. I'm displaying plots
> and such with white backgrounds. If I want to create
> an image with the white background knocked out, so I
> can put the plot on another image, I just do something
> like this:
>
> IDL> Histoplot, LoadData(7)
> IDL> transparent = Make_Transparent_Image(Color='white')
> IDL> LoadCT, 22
> IDL> TVImage, Loaddata(7)
> IDL> TVImage, transparent, POSITION=[0.5, 0.5, 0.95, 0.95]
>
> Totally cool! :-)
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Thanks again! Very useful stuff. :-)=
-Jeremy.
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