Now create a New Layer (have Foreground set to Red when you do this). There should now be a nice green and alpha image with no trace of the blue left. Click OK after the color indicator on the Color To Alpha plug-in is changed to blue. If using Gimp for Windows, you’ll have to right-click on the destination button and select the Foreground - drag n’ drop doesn’t work. Click, hold, and drag from the color portion of this window to the color portion of the Color To Alpha plug-in. When you used the color picker to select the background, a window with the color popped up. Next use the Color Picker Tool to select the background color. Normally they are filled with an image, but they may also be empty. If its not there, upgrade your gimp to 1.2.x. The layers are completely transparent and can be stacked on top of each other. Step 3: After clicking the Add Alpha Channel, click the Fuzzy Select Tool on the tools. In this way, this will make your background transparent when rendered instead of white or black. Right-click using your mouse and select Add Alpha Channel. In the Color to Alpha window, choose a color that will be considered as transparent. Within the image editing jargon, alpha refers to the alpha channel of an image, which controls the transparency level of the pixels. After that, go to the image layer section. To do this, select the layer and then go to Layer > Transparency > Color to Alpha. The object you selected will appear on top of a transparent background. Choose in your computer file which image you want to edit. Now, click OK and move the new white layer to the bottom of all the current layers. Then make sure you select White for the Layer Fill Type. If its grayed-out, it means that you have an indexed image. Press 'Ctrl-I' to invert the selection and then 'Ctrl-X' to remove the part of the image you dont want. Yes, that would be very easy, I just opened up Gimp 2 my self and tried it out to make sure :p Anyway, in the layers panel, right click and choose New Layer. Its menu location is Filters -> Colors -> Color To Alpha, where means to right click on the image. The first step is to activate the color to alpha plug-in. Instead, may I suggest the rest of the tutorial? Step 1 ¶ You can go too far, and blend it back to something close, but this is time consuming. Anything short of the rightmost image has some blue in the pixel, which will stick out. You can spend hours trying to find something that will work perfectly, but you won’t. You can try getting rid of all the ugly pixels, but then you’ll end up with something jagged like on the right. The middle one is close, but there are some ugly visible pixels still. This differs from the use of the layer Opacity slider as a mask has the ability to selectively modify the opacity of different areas across a single layer. They allow you to selectively modify the opacity (transparency) of the layer they belong to. This looks somewhat neat, but not what we’re going for. by Pat David Intention Layer masks are a fundamental tool in image manipulations. The left one has a blue border around it. When these are filled, we are left with flat black and slightly blueish-green pixels between them, or no transition to black at all.Ĭompare each with the target image below. You’ll note that each of the three zoomed in selections above have varying amounts of the green-blue mix selected. However, when removing an anti-aliased object from its background is not a good idea, as shown above. The common approach to doing many things in GIMP is to first get a good selection. This tutorial doesn’t address the complexities of handling real-world photos in this manner, but does briefly discuss it at the end. To illustrate this, this tutorial will use the above images as source and destination. Select the area you want to make transparent. The aim is to show the advantages of using the color to alpha plug-in over selection-based techniques. How to make a transparent background/selection on an image using GIMP. This tutorial shows you how you can efficiently replace the background of an image with another in GIMP, through the use of the color to alpha plug-in. of which fully transparent parts are treated as background, or in case alpha channel is.
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