Wallpaper resolution determined by number of screens? Formula?

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Search came up blank, sorry if this is mentioned elsewhere.

Alright so the screen resolution for this device is 320x480, and the default android home features 3 screens. Wallpapers are stretched across all 3 screens..so you would think 3x the width with the same height. However, most information I find says that the correct wallpaper size would be 640x480.. which would only be 2x the size.

It's easy enough to just say double the width, but that only works for 3 screens(?). I'm interested in the formula here so I can determine the correct wallpaper size for 5 or 7 screens.

Is it the obvious +1/2 width for each additional screen? For instance:

320x480 resolution, 3 screens. 320+(320/2)+(320/2)= 640, 640x480
320x480 resolution, 5 screens. 320+(320/2)+(320/2)+(320/2)+(320/2)= 960, 960x480
400x854 resolution, 3 screens. 400+(400/2)+(400/2) = 800, 800x854

Am I on the money with this?

I dont think it actually adds anything to the size with more screens. I think it just divides it differently. I have used the same wallpaper with 3/4/5 screens and the pic is always the same.

You have to remember the wallpaper doesn't get stretch rather the space on top of the displayed area gets divided depending on how many home screens you have. In all the final wallpaper is still 640x480 but it overlaps in 3, 5, 7 etc places.

Just think of each of the 'screens' overlapping to understand how the homescreen works.

So then the proper wallpaper size for any Android device is 2x width x height? Or is it device specific.

Originally Posted by Celeras

So then the proper wallpaper size for any Android device is 2x width x height? Or is it device specific.

i think now with the Tattoo being available it depends on the device.

i think i would go with 'device-specific'. i'm curious what resolution builds like the pulse version uses.

it's rather apparent that the current 320x480 devices just use a shorter pan across a 640x480 image when the number of homescreens goes up. i suppose we could all just use larger wallpaper images, since android will crop oversized images to the appropriate resolution depending on what device it's on.

Originally Posted by jayzusfk

i think i would go with 'device-specific'. i'm curious what resolution builds like the pulse version uses.

it's rather apparent that the current 320x480 devices just use a shorter pan across a 640x480 image when the number of homescreens goes up. i suppose we could all just use larger wallpaper images, since android will crop oversized images to the appropriate resolution depending on what device it's on.

I read the Pulse uses a 2:3 ratio, it uses two rows of three screens after all. I read something like 512x768 works well.

As Prash said.

For the G1, wallpaper is 640x480. If you had 50 screens, it'd still be 640x480.

However, different devices have different screen resolutions.

Not even worth reading

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Originally Posted by Celeras

Search came up blank, sorry if this is mentioned elsewhere.

Alright so the screen resolution for this device is 320x480, and the default android home features 3 screens. Wallpapers are stretched across all 3 screens..so you would think 3x the width with the same height. However, most information I find says that the correct wallpaper size would be 640x480.. which would only be 2x the size.

It's easy enough to just say double the width, but that only works for 3 screens(?). I'm interested in the formula here so I can determine the correct wallpaper size for 5 or 7 screens.

Is it the obvious +1/2 width for each additional screen? For instance:

320x480 resolution, 3 screens. 320+(320/2)+(320/2)= 640, 640x480
320x480 resolution, 5 screens. 320+(320/2)+(320/2)+(320/2)+(320/2)= 960, 960x480
400x854 resolution, 3 screens. 400+(400/2)+(400/2) = 800, 800x854

Am I on the money with this?

Just take the original width and multiply it by the number of screens you have. No need to do this /2 crap. Makes no sense....regardless of what you read. Now...if you wanted to have say 5 screens with less wallpaper scrolling when you transition from screen to screen...then you could implement your division tables as stated in your original post. It really functions no different than a desktop with multiple monitors....other than the fact that you have one screen and wallpaper scrolling on the Android device.

EDIT:....I guess I have been working too many hours....totally forgot about the fact that you have to crop images when setting your wallpaper. That being said....stick with 640X480. I am gonna go punch myself in the face now.

Size of the background does not matter. The ssytems will scale it when you choose the wallpaper. Or you can manually select what you see in the gallery.

If you need the background to look a specific way then yes the size matters.
Since the system will stretch or shrink as needed.
Proportion is more important. 640x480, 1280x960, 800x600 They will all scale to the same appearance.


As for screens:
What changes is the amount of the background that shifts.
On 3 screens the left screen see 0-50 of the picture, the right sees 50-100 the center screen sees 25-75.

On 9 screens: These numbers are off because it actually takes like 6.22 or something but this is close.
screen 1 = 0-50
screen 2 = 6-56
screen 3 = 12-62
screen 4 = 18-68
screen 5 = 24-74
screen 6 = 30-80
screen 7 = 36-86
screen 9 = 42-92
screen 9 = 50-100