RSS/Atom feed Twitter
Site is read-only, email is disabled

Trouble making transparent "white" images

This discussion is connected to the gimp-user-list.gnome.org mailing list which is provided by the GIMP developers and not related to gimpusers.com.

This is a read-only list on gimpusers.com so this discussion thread is read-only, too.

2 of 2 messages available
Toggle history

Please log in to manage your subscriptions.

Trouble making transparent "white" images danman 04 Jun 20:11
  Trouble making transparent "white" images DJ 05 Jun 03:45
2009-06-04 20:11:49 UTC (over 15 years ago)
postings
1

Trouble making transparent "white" images

Hello,

I am trying to make an image with the main part of it as a white object and everything else transparent. I've followed tutorials and examples on how to do this (add alpha channel, select the background color, delete it) and it works fine if my object is not white, but if it is white then it, too, becomes transparent. When I look at the image in IE it looks OK but, used in an OpenGL application, it is just a blank image. I have a different white transparent GIF that I didn't create using GIMP, and it behaves as expected (white where it should be white, transparent where it should be transparent). I do not understand the difference between the two and was hoping someone here could point me in the right direction.

I am using GIMP 2.6.4 on Windows XP.

Thanks,

Dan

DJ
2009-06-05 03:45:24 UTC (over 15 years ago)

Trouble making transparent "white" images

Hi Dan, gimp users,

I am trying to make an image with the main part of it as a white object and everything else transparent. I've followed tutorials and examples on how to do this (add alpha channel, select the background color, delete it) and it works fine if my object is not white, but if it is white then it, too, becomes transparent. When I look at the image in IE it looks OK but, used in an OpenGL application, it is just a blank image. I have a different white transparent GIF that I didn't create using GIMP, and it behaves as expected (white where it should be white, transparent where it should be transparent). I do not understand the difference between the two and was hoping someone here could point me in the right direction. I am using GIMP 2.6.4 on Windows XP.

Did you find a solution? If so what was it?

Otherwise, I just tried the following:

1. I open a photograph. 2. Layer > Transparency > Add Alpha Channel (or right-click layer ...). 3. For a test, I did a rough selection with the Free Select Tool. 4. Dragged white to the selection.
5. Select > Invert.
6. Hit the "Delete" button.

I wonder if you checked out: Layer > Transparency > Color to Alpha