Images, sizes and different screens (fragmentation)

Question

I have a logo to put in a splashscreen. Currently, the image size is 960x320 pixels. I have read the developers google post, of the supported screens, but I don't have any idea of what size need to be in a ldpi, mdpi, hdpi or xhdpi.

I see a table in another answer that says:

ldpi x0.75
mdpi x1.00
hdpi x2.00

I don't know if this is true or not. Could someone shed some light? ^^

Answer 1

You can use android dpi (http://coh.io/adpi/) calculator to calculate image size for different resolution

Answer 2

So take 960x320 as your base density (1x = mdpi).

To get to the other ones you multiply the base size by the other sizes.

So to get to hdpi multiply you base by 1.5, 960x320:

960 x 1.5 = 1440
320 x 1.5 = 480

This applies from your base density which is generally mdpi.

ldpi = 960 x 0.75 and 320 x 0.75
mdpi = 960 x 1.0 and 320 x 1.0
hdpi = 960 x 1.5 and 320 x 1.5
xhdpi = 960 x 2.0 and 320 x 2.0
xxhdpi = 960 x 3.0 and 320 x 3.0

And so forth. Generally its best to use a calculator until you understand in more detail why they need to be like that.