When you want to return to editing the layer image instead of the layer mask, go back to the Layers tab and click on the thumbnail of the layer image. You can always switch back and forth between black and white paint to add or remove transparency on the layer mask. If you prefer to start with a transparent image and brush on the part you want visible, just start with a layer mask which is Black (Full Transparency) and apply your brush effect to the layer mask with the color white.
If you switch to the Channels tab, you will see in real time how the alpha channel changes as you paint on the layer mask. Graphics Tutorials Interlaced/Transparent GIFs Image Sizing Color Depth. Choose your brush effect and the color black, and apply your brush effect. that might be helpful in adding more visual impact to your page and site. Be sure to Layer-Transparency-Add Alpha Channel. Click on the thumbnail to edit the layer mask. Add a transparent layer if not yet present ( Layers > Transparency > Add Alpha Channel) Clear ( Edit > Clear or Del) the selected color to make it transparent: Use the 'Select by Color Tool'.
Under the Layers tab, you should now see the white thumbnail of the layer mask, next to the thumbmail of the layer image. Presuming you'll start with a visible image and brush away the part you want transparent, the best choice is White (Full Opacity).
A dialog box will ask you how you want the layer mask to be initialized. Under the Layers tab, right click the layer to edit and choose Add Layer Mask. To edit the alpha channel, add a layer mask and apply the brush effect to the layer mask.
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