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Alpha channel in raster images [message #13597]

Wed, 16 January 2008 12:32

Engeor
Messages: 12
Registered: January 2008

Promising Member

Does UPP load an alpha channel stored in raster images such like TIF or BMP? Is anything special need to be done to do this? Because I have tried to load an image with an alpha but it doesn't seems to work (image was not displayed as transparent).

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Re: Alpha channel in raster images [message #13599 is a reply to message #13597]

Wed, 16 January 2008 13:38

zsolt
Messages: 705
Registered: December 2005
Location: Budapest, Hungary

Contributor

AFAIK, alpha channel is supported in PNG only.

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Re: Alpha channel in raster images [message #13860 is a reply to message #13599]

Wed, 30 January 2008 12:13

Engeor
Messages: 12
Registered: January 2008

Promising Member

I am not able to get alpha values even from PNG. I can set alpha once the image is loaded (one by one) but I am not able load an alpha stored in file.

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Re: Alpha channel in raster images [message #13861 is a reply to message #13860]

Wed, 30 January 2008 12:32

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Engeor wrote on Wed, 30 January 2008 06:13

I am not able to get alpha values even from PNG. I can set alpha once the image is loaded (one by one) but I am not able load an alpha stored in file.

Could you provide the testcase?

(A package that tries to load .png and does not work + .png itself).

Mirek

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Re: Alpha channel in raster images [message #13862 is a reply to message #13861]

Wed, 30 January 2008 12:33

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

(zipped)

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Re: Alpha channel in raster images [message #13891 is a reply to message #13597]

Thu, 31 January 2008 12:25

Engeor
Messages: 12
Registered: January 2008

Promising Member

I am sorry. It was a way how an image have to be saved from Photoshop what needs to be corrected.

(I just tried to save an alpha channel but it does not work. Then I have deleted a background layer and saved just one non-bg-layer where transparent pixels ware erased. Sorry again.)

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