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Why isn't my alpha channel working?

https://gyazo.com/f51525c7999c26653553607b82f4895d https://gyazo.com/0c41666c811c95ca0404c0cb4bfa7927 As you can see, the alpha channel is fully white. Is this normal?

Product Version: UE 4.9
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asked Sep 06 '15 at 06:27 PM in Using UE4

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avatar image Steve_T Sep 06 '15 at 06:30 PM

What file type are you importing. If it's .tga have you saved it as 32bit?

avatar image CaotainET Sep 06 '15 at 06:42 PM

its a .psd

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3 answers: sort voted first

It's hard to see from your image what exactly is supposed to be the alpha channel. I imported a .psd image with a transparent background and it showed the background with a checkered pattern when I opened the asset, but the normally you can't see the transparent background in the preview icon if that's what you're talking about.

A way to test if your transparency works properly is to create a new material with 'Blend Mode' set to 'Translucent' and connect the alpha channel of your image to 'Opacity'. alt text

catpture.jpg (76.4 kB)
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answered Sep 06 '15 at 07:41 PM

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avatar image CaotainET Sep 06 '15 at 07:51 PM

I was trying to follow this Tutorial and i noticed that alpha chanel was fully white.

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that would be a problem with the image then. you can remove the alpha chanel color in photoshop, or remake the image.

When you check off alpha and red/green or green/blue you should see your image with no background any color.

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answered Sep 06 '15 at 09:41 PM

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For anyone who might need help. It turned out my PSD wasnt int the right image mode type.

Mine was set to greyscale. Make sure to change it to "RGB Color". Go to Image>Mode>RGB Color. Select to not merge your layers.

Re-import the png and it should work now.

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answered Apr 21 '18 at 05:44 PM

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