How do I make a Layer Transparent on GIMP?

Question

I want to have muliple pictures in a layout, how do I make some of the layers partially transparent?

Answer 1

Transparent images are useful when you are not certain of the page background color on which your image will be displayed, or you intend to display your image in front of a complex background rather than a single background color. Both GIF and PNG images can have transparent backgrounds. JPEG images cannot. PNG images can also have semitransparent areas that "blend" with what appears behind and in front of them; this is called "alpha channel" blending. However some older web browsers do not support partial transparencyAll serious graphics programs provide ways to make an image transparent. The exact steps for each program vary; you will want to consult the online help for your program. For instance, GIMP, a free graphics editing program for both Windows and Linux, makes it easy to create a transparent image:

1. Pull down the File menu.

2. Pick "new."

3. Click the "+" sign next to "Advanced Options."

4. Select "Transparency" from the "Fill with:" menu.

5. Click "OK."



You now have a completely transparent image, to which you can add additional elements. In order to preserve the transparency for use on a website, you will need to save this image in GIF or PNG format. JPEG images do not support transparency.



Advanced programs like The Gimp and Photoshop support the idea of an "alpha channel," which allows every pixel (dot) to have any level of transparency, from completely opaque to completely transparent and anything in between. This is useful because it creates much smoother transitions. And the PNG file format supports alpha channel too.



The good news is that Internet Explorer 7 and Firefox both support PNG's alpha channel transparency very well. The bad news is that some older browsers might not (they will show the image, but they will not show the transparent areas correctly). The alternative is to use GIF images. Unfortunately, GIF supports only 100% transparency, so you will lose some elegance when using a transparent GIF instead of an alp

Answer 2

Gimp Layer Transparency

Answer 3

1

Answer 4

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Right click the layer and choose delete alpha channel. The Alpha channel is the transparency component of a layer. In both The GIMP and Photoshop, to understand layers, think of it like this: the background layer is llike a sheet of opaque paper on which you can paint, draw, or it could be a photograph, the layers above that are like an acetate or transparent overlay sheet on which you can also draw, paint, delete or even paste images etc. By default, the overlay sheets (the layers) are transparent. If you make them opaque (by deleting the alpha channel) they will hide all the subsequent layers underneath. Unlike traditional acetates, you can set the mode of the layer so that it overlays the underlying layers in different ways. These are called the layer modes. There are various modes you can apply to a layer. If you have an image with a background layer and a layer above it, try experementing by going to the layers panel. Select the layer, then change the layer mode by clicking on the downward pointing arrow to the right of the mode. Try out all the modes by selecting one at a time to see the effects you can get. Have fun!

Answer 5

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RE:

How do I make a Layer Transparent on GIMP?

I want to have muliple pictures in a layout, how do I make some of the layers partially transparent?

Answer 6

Gimp Opacity

Answer 7

Use layer masks. (Layer->Mask->Add Layer Mask). Coloring over a part of the layer mask black makes that part of the layer transparent; coloring a part of the layer mask white makes that part of the layer opaque.



This page can probably give a better explanation on using layer masks than I can: http://gug.sunsite.dk/tutorials/toskala8/



If you meant making the layers partially transparent as in changing their opacity, there's a little slider labeled Opacity in the Layers, Channels, Path window under Mode (usually, Normal is selected in the box). 0 means 100% transparent, and 100.0, which it normally is, is 100% opaque. If you need an illustration, look here: http://www.ischool.utexas.edu/technology/tutorials/graphics/gimp/03_layers/05_opacity.html