White background instead of transparent

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White background instead of transparent

rich2005
I want to make a transparent background, so first I go layer - transparency -
add alpha channel.

I select around my image and then go select - invert selection. Then I delete
the background

I am left with the image I want and the transparent checkerboard background just
like how I've done it for years

When I got the export I export as PNG my image has a white background instead of
a transparent one..



I was having no trouble with this, yesterday it worked just fine, this just
started today so I re installed gimp. Maybe something in my registry is
corrupted.

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Re: White background instead of transparent

Ofnuts-2
On 04/27/17 17:46, stefanped wrote:

> I want to make a transparent background, so first I go layer - transparency -
> add alpha channel.
>
> I select around my image and then go select - invert selection. Then I delete
> the background
>
> I am left with the image I want and the transparent checkerboard background just
> like how I've done it for years
>
> When I got the export I export as PNG my image has a white background instead of
> a transparent one..
>
>
>
> I was having no trouble with this, yesterday it worked just fine, this just
> started today so I re installed gimp. Maybe something in my registry is
> corrupted.
>
No need to reinstall. Gimp doesn't use the registry anyway, everything
is in your Gimp profile(*).

But still I would ascribe that to user error. Can you show(**) a
screenshot of the layers list before you export?

(*) http://www.gimp.org/tutorials/GIMPProfile/

(**) Put on imgur.com, and post link here
<http://www.gimp.org/tutorials/GIMPProfile/>


<http://www.gimp.org/tutorials/GIMPProfile/>

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White background instead of transparent

rich2005
Hi, here is what things look like from my end.

Attachments:
* http://www.gimpusers.com/system/attachments/563/original/layers.PNG

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White background instead of transparent

rich2005
>Hi, here is what things look like from my end.

Question, does this happen when the png file is re-opened in Gimp

or

Are you using a separate viewing application. Not all will 'honour'
transparency.

example: http://i.imgur.com/F4F8ry4.jpg

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Re: White background instead of transparent

Pat David
In reply to this post by rich2005
When you export the image to PNG, did you check the box to "Save color
values from transparent pixels"?
http://i.imgur.com/1mnIJO6.png

On Fri, Apr 28, 2017 at 3:07 AM stefanped <[hidden email]> wrote:

> Hi, here is what things look like from my end.
>
> Attachments:
> * http://www.gimpusers.com/system/attachments/563/original/layers.PNG
>
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Re: White background instead of transparent

Joao S. O. Bueno Calligaris
Things look alright on GIMP side from yur screenshot, but for the fact
your image filename lists it as a ".jpg".

The jpg file format has no support for transparency, and the
"simptons" of trying to save transparency to such a file would be
exactly waht you describe.

Are you sure you are really making your export to a png file? And if
so, are you sure the other application you are using to view the file
correctly supports/shows this transparency?

Regards,

   js
 -><-

On 28 April 2017 at 12:24, Pat David <[hidden email]> wrote:

> When you export the image to PNG, did you check the box to "Save color
> values from transparent pixels"?
> http://i.imgur.com/1mnIJO6.png
>
> On Fri, Apr 28, 2017 at 3:07 AM stefanped <[hidden email]> wrote:
>
>> Hi, here is what things look like from my end.
>>
>> Attachments:
>> * http://www.gimpusers.com/system/attachments/563/original/layers.PNG
>>
>> --
>> stefanped (via www.gimpusers.com/forums)
>> _______________________________________________
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>> List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list
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>>
> --
> https://patdavid.net
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Re: White background instead of transparent

Joao S. O. Bueno Calligaris
In reply to this post by Pat David
On 28 April 2017 at 12:24, Pat David <[hidden email]> wrote:
> When you export the image to PNG, did you check the box to "Save color
> values from transparent pixels"?
> http://i.imgur.com/1mnIJO6.png

Even with this checked, transparency will still be transparency. It
should be checked depending of the intended use of the png file - if
you want to be able to "unerase" parts of it, or if it is being used
as texture on a 3D program you will need to check it - otherwise leave
it unchecked for better compression.


>
> On Fri, Apr 28, 2017 at 3:07 AM stefanped <[hidden email]> wrote:
>
>> Hi, here is what things look like from my end.
>>
>> Attachments:
>> * http://www.gimpusers.com/system/attachments/563/original/layers.PNG
>>
>> --
>> stefanped (via www.gimpusers.com/forums)
>> _______________________________________________
>> gimp-user-list mailing list
>> List address:    [hidden email]
>> List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list
>> List archives:   https://mail.gnome.org/archives/gimp-user-list
>>
> --
> https://patdavid.net
> GPG: 66D1 7CA6 8088 4874 946D  18BD 67C7 6219 89E9 57AC
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Re: White background instead of transparent

Ofnuts-2
In reply to this post by rich2005
On 04/28/17 03:49, stefanped wrote:
> Hi, here is what things look like from my end.
>
> Attachments:
> * http://www.gimpusers.com/system/attachments/563/original/layers.PNG
>
Exporting such an image as a PNG works for me, but for a similar-sized
image, the PNG is 32MB, slow to export, and slow to load.

This said, have you checked with several different image viewing apps
that your background is always white, because the white background can
be added by the image viewer (for instance Firefox displays transparency
as a very light gray (224,224,224)) . And what do you get when you open
the PNG in Gimp? Is the transparency gone?


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White background instead of transparent

rich2005
In reply to this post by Joao S. O. Bueno Calligaris
>Things look alright on GIMP side from yur screenshot, but for the fact
>your image filename lists it as a ".jpg".
>
>The jpg file format has no support for transparency, and the
>"simptons" of trying to save transparency to such a file would be
>exactly waht you describe.
>
>Are you sure you are really making your export to a png file? And if
>so, are you sure the other application you are using to view the file
>correctly supports/shows this transparency?
>
>Regards,
>
>   js
> -><-

The issue was, even though i selected PNG from the drop down on the right, it
was exporting as jpeg. I hit the + select file type (by extension) on the left
and a box popped up and from there i selected PNG and that fixed it.

Attachments:
* http://www.gimpusers.com/system/attachments/564/original/Capture.PNG

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Re: White background instead of transparent

Michael Schumacher
On 05/04/2017 04:53 AM, stefanped wrote:

> The issue was, even though i selected PNG from the drop down on the right, it
> was exporting as jpeg. I hit the + select file type (by extension) on the left
> and a box popped up and from there i selected PNG and that fixed it.

Nothing broken there - the file type filter on the right limits the
displayed files to those matching the type chosen, and the file type
selection can be used to choose a type (and file name extension) for the
exported file.

There's hardly ever any need to change the latter from its default "By
extension" setting, though.


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