O'Reilly logo

Mastering openFrameworks: Creative Coding Demystified by Denis Perevalov

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Transparency

Using the methods described in the earlier sections, we can construct overlapped collages of images, changing their size, orientation, and color. Until now, such collages were made of images, which look like colored rectangles. But we often want to have collages made of non-rectangular images, as shown in the following screenshot:

Transparency

In the preceding screenshot, the collage is made of a number of sunflower images, having not a rectangular but quite a difficult curvilinear shape. Modeling such shapes directly is a difficult and memory-consuming task. A more elegant solution, used in raster graphics, is using the alpha channel. In this technique, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required