Partial transparency can also be used to make an image less prominent, such as a watermark or other logo or to render something see-through, such as a ghostly apparition in a video game. See also monochrome or with shades of gray and anti-aliasing. Instead of each pixel either being transparent or not transparent, it can be set to 254 levels of partially transparent, allowing some of the background image to show through the foreground image.Ī major use of partial transparency is to produce "soft edges" in graphics so that they blend into their background.
Some image formats, such as PNG and TIFF, also allow partial transparency through an alpha channel, which solves the edge limitation problem. It can be transparent against any background despite being anti-aliased. This image has partial transparency (254 possible levels of transparency between fully transparent and fully opaque). Outside the world of web browsers, support is fairly hit-or-miss for transparent GIF files.Įdge limitations of transparent pixels This support often does not extend to printing, especially to printing devices (such as PostScript) which do not include support for transparency in the device or driver. The transparent color should be chosen carefully, to avoid items that just happen to be the same color vanishing.Įven this limited form of transparency has patchy implementation, though most popular web browsers are capable of displaying transparent GIF images. in a run of text, a special symbol for which an image is used because it is not available in the character set, can be given a transparent background, resulting in a matching background.an image that is not rectangular can be filled to the required rectangle using transparent surroundings the image can even have holes (e.g.This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image. One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color.
It can be transparent against any background because it is monochrome.
#Translucent background how to
If you have a complex background to remove, you need to take a different approach to do your job.įor the second part of this tutorial, I will demonstrate how to remove the background by adding a transparent layer and how to add a layer of your preference.This image has binary transparency (some pixels fully transparent, other pixels fully opaque). All done! Advanced tutorial: Removing the complex background of an image in GIMP To export the image go to File -> Export As, choose PNG file format and click on Export. I have to remove the blue background in this example. You might have to repeat the steps 2 to step 4 if necessary. If you have other different coloured regions that you need to remove, click on them and delete them. Press the Delete keyboard button to remove the background. Layer -> Transparency -> Add Alpha Channel Step 4: Delete the background If your image has only one layer (like our example), this background layer has no Alpha channel. It represents the transparency of the image. An alpha channel is automatically added into the Channel Dialog as soon as you add a second layer to your image.
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