cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   vsching
   Member

   Hi guys, its more of a general iphone problem instead of a cocos2d question. However i got some doubt about ppi(not dpi).

   Do we need to set ppi to 163(iphone) and 326(iphone 4) to optimized the appearance of our image? Or should we just use 72ppi? As i tested, if we increase the ppi, the pixel is increasing as well..

   For e.g my bootup. 320x480 and 640x960 becomes 724x1087(163ppi) and 1449x2173(326ppi) after changing the ppi from 72.

   Sorry for my bad english.. I'm searching all over the net but can't seems to figure it out..

   Please help :(

   Posted 1 year ago #
2. 

   CJ
   Moderator

   Just go off of the pixel resolution of each device.

   The ppi/dpi setting in photoshop may be helpful to you if you want to position things in real world space such as inches or cm. But ultimately you end up with x pixels by y pixels and it will be rendered at a given ppi on the device.

   NOTE: If you are setting the ppi/dpi correctly in your graphics program it will not change your pixel dimensions. So you may want to set the ppi/dpi first then enter the original pixel dimensions back in. This should only change the image dimensions in inches/cm w/o affecting resolution.

   Posted 1 year ago #
3. 

   vsching
   Member

   I think i got what u mean.. i draw a 320x480 pixel then i export it to 163. that's causing the problem..

   So, to take advantage of the retina display, i just needed to double the pixel for my image using 72ppi(default)? and it will auto rendered to the iphone ppi?

   Posted 1 year ago #
4. 

   CJ
   Moderator

   Well...

   If you make your image at 640x960 and set your contentscale to 2 then the retina display will look ideal.

   For other devices you want an image that is 320x480.

   The ppi setting you design with has no effect, it is only used if you want to print it out on paper. As I said before you may want to set it for other reasons, such as knowing how many inches large something is in pixels w/o busting out a calculator.

   Posted 1 year ago #
5. 

   vsching
   Member

   got it.. cheers......

   Posted 1 year ago #

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