To design icons in many resolutions, Which of the following approaches: * to create them in vector graphics, as svg or ai and then rasterize them, * to design them directly as bitmap graphics (formats bmp jpg png, and separate files for each resolution)?
is better in the following factors: *dependable: will not fail to provide a good quality output and force to start from scratch *easier to learn for beginners in computer-aided graphic design *faster to finish *easier to modify later *better quality of output *more common to be used *have good tools, including open-source tools and support for Linux
and the use case is: launcher icons for android app: http://developer.android.com/design/style/iconography.html Launcher icons on a mobile device must be 48x48 dp ( denisty-independent pixels: 1dp is one pixel on 160 dpi screen),therefore 3 sizes needed
Launcher icons for display on Google Play must be 512x512 pixels. That is the fourth size