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How to make a transparent 'png' image from black (not transparent) to nothing (absolutely transparent) in GIMP smoothly?

As result, this image on the red image gives the image from black via dark red to red?

This is an example (but not of good quality, I'd like to know how to make this image properly):

enter image description here

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Can you provide a sample image of what you are talking about? – ckpepper02 Jan 23 '14 at 14:54
Just added. Thank you. – Haradzieniec Jan 23 '14 at 15:06
up vote 5 down vote accepted

What you are looking for is a gradient.

Here is a tutorial on how to make a gradient in Gimp.

Here's on how to make a custom gradient.

  • In your case you would make your gradient as a layer that like you said smooths from black to nothing, this will be your gradient layer. The layer under this will simply be filled in red. With the gradient on top it will make the effect that you want.

  • Alternatively you could just have a layer of a custom gradient that goes from black to red.

Hope this helps. :)

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There is no need for a custom gradient in this case. One of the built-in gradients is "foreground color to transparency" - all that is needed is to create a new, transaprent image, and fill it with the belnding tool, unsing the FG to Transparent gradient. – jsbueno Jan 23 '14 at 22:08
Exactly :) thank you for clarifying. I thought that it would be beneficial to mention the option to customize. – Jenna Jan 24 '14 at 0:11

You have to add a layer mask. (Right click on Layer → Layer Mask → Add alpha channel of the layer)

And then can you use the gradient tool

Here is an tutorial with pictures.

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