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Transparency not working on a PNG generated by PowerPoint
http://gimpchat.com/viewtopic.php?f=8&t=19343		 Page 1 of 1
Author:  Autopulous [ Fri Apr 23, 2021 10:50 am ]
Post subject:  Transparency not working on a PNG generated by PowerPoint
GIMP Version: 2.8.14
Operating System: Windows
OS Version: Windows 10 Pro - 20H2
GIMP Experience: Intermediate Level


Hello;

I have a .png file that I used PowerPoint to create (attached) - I just want to turn the white areas around the left and right sides of the "logo" transparent - I've set the alpha channel and the area that I want to make transparent shows the checkerboard pattern indicating that the alpha channel is activated... I save the file as a .png with the save background color option unchecked, yet when I view the file in a browser or even looking at the thumbnail in Windows Explorer the areas that should be transparent are white...

Any help would be appreciated.

Attachments:
File comment: File for which I cannot achieve transparency around the outside
MLFPSJRXV.png
MLFPSJRXV.png [ 688.37 KiB | Viewed 1805 times ]
Author:  rich2005 [ Fri Apr 23, 2021 11:09 am ]
Post subject:  Re: Transparency not working on a PNG generated by PowerPoint
There is nothing wrong with your png file. All to do with the viewer that you use. Some support transparency, some do not.

Attachment:
viewer.jpg
viewer.jpg [ 225.27 KiB | Viewed 1798 times ]
Author:  Nidhogg [ Fri Apr 23, 2021 11:23 am ]
Post subject:  Re: Transparency not working on a PNG generated by PowerPoint
"Save background color" has nothing to do with the image being transparent or not, it just saves the background color data.
In this image "transparent" is your original, and "untitled" is saved with red background color. They are both transparent as you can see.
If I open the one with red background color saved and exported to png, and remove alpha channel the background will turn red.

Attachment:
Transparent-BG-Color.png
Transparent-BG-Color.png [ 308.41 KiB | Viewed 1798 times ]


Now fix the edges of the image, because there's some visible white.
Author:  Autopulous [ Fri Apr 23, 2021 11:34 am ]
Post subject:  Re: Transparency not working on a PNG generated by PowerPoint
@rich2005 - the Chrome browser support transparency and it is showing the white periphery... and in the past I've been able to make images with transparency that display correctly in Chrome - perhaps this is technically a Chrome issue (not Gimp) but I'd like to understand the difference.
Author:  Autopulous [ Fri Apr 23, 2021 11:36 am ]
Post subject:  Re: Transparency not working on a PNG generated by PowerPoint
@Nidhogg - yes there is some sloppiness on the edges - I will clean these up... thanks for taking a look
Author:  sallyanne [ Sat Apr 24, 2021 12:48 am ]
Post subject:  Re: Transparency not working on a PNG generated by PowerPoint
The other reason it shows white in here is, transparency will show the colour of the page.
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