I'm trying to create watermark so I want my logo layer to be transparent. How do I achieve this? I tried all the existing guides but they aren't working. The layers are in JPG format by default when I import them. Can someone give me the step by step directions?
Drag general picture to a empty Gimp window or open it from File dialog (Ctrl+O).
Drag second picture (watermark) to already opened image document or Open as Layers.. from File dialog (Ctrl+Alt+O). Now you will see 2 layers in Layer tool (Ctrl+L). Make sure than watermark image is above of layer of general image.
Right click on watermark layer and select Edit Layer Attributes...
In Layer Attributes set Opacity to 20-25 or smaller.
Optional: move your watermark layer or duplicate it.
There is no transparency support in the JPG format. When you open a JPG in Gimp (and in Gimp 2.10, when use
File>Open as layers), the layer has no alpha-channel, which is how you control transparency of pixels. This is easily checked, when there is no alpha-channel on a layer:
- the layer name is in boldface in the Layers list
- the menu
Layer>Transparency>Add alpha channelis not grayed out (when that mayer is active).
To add an alpha channel, you of course use
Layer>Transparency>Add alpha channel.