Channels / transparency. How to make?

[rich2005]

(05-29-2023, 08:13 PM)leabreuh Wrote: I want to do the same as the example above in this image here. is it possible?

For that first image: As PixLab noted, Layer -> Transparency -> Semi-Flatten does leave a hard border.  I fix that by selecting the transparent area, then erasing the border using a small brush and stroking the selection with the eraser tool.

You can improve that flat looking image by using: Colors -> Auto -> White Balance.

...and I think the ultimate requirement is an image, easily coloured maybe for selling clothing. There are often multi-layer .PSD images that add options just by making layers visible. Make your own starting by;

Use a layer mask.
Get a selection from the image. Layer -> Transparency -> Alpha-to-selection

Make a new layer and create a layer mask: Layer -> Mask -> Add Layer Mask then choose the From Selection Option.

Turn selection off and put that layer into Darken Only mode.

The image is colored by filling the layer. Change colour as required. Save this as a Gimp .xcf file. For web use, Export as a .PNG image.

This a 3 minute example of all that. https://youtu.be/yGTEf9n2AEs





..and the second image attached as a Gimp .xcf.gz file. Just open with Gimp.