png « graphics « iPhone iPad Media Q&A

1. Performance-wise: A lot of small PNGs or one large PNG?    stackoverflow.com

Developing a simple game for the iPhone, what gives a better performance?

1. Using a lot of small (10x10 to 30x30 pixels) PNGs for my UIViews' backgrounds.
2. Using one large PNG and clipping to ...

2. How many bits per component do I have to specify for pngcrunch-optimized 24bit PNG files with alphatransparency?    stackoverflow.com

CGBitmapContextCreate takes an parameter that's not very obvious to me:

For example, for a 32-bit pixel format and an RGB color space, you would specify a value of ...

3. Export CGPath as JPG or PNG    stackoverflow.com

Is it possible to take a path draw in an UIView with CGPath and export it as a PNG?

4. How to convert image sequences (PNG) into Animation File (gif/mov/others) (iPhone)?    stackoverflow.com

I have a sequence of images (PNG format) in my iphone app. It is saved in the app's sandbox doc folder. How do I create animation file from these images? I would ...

5. Advice on using vector graphics on the iPhone    stackoverflow.com

A question for the seasoned iPhone developers, what is your preference for graphics in an iPhone app? I have turned to PNGs because I read that is the preferred image format ...

6. Does CGContextDrawImage decompress PNG on the fly?    stackoverflow.com

I'm trying to write an iPhone app that takes PNG tilesets and displays segments of them on-screen, and I'm trying to get it to refresh the whole screen at 20fps. ...

7. How to avoid calls to png_read_filter_row and transform_premul_argb_fn in Core Graphics?    stackoverflow.com

I'm having some performance problems with images in my app. I assign a UIImageView to the backgroundView property of a UITableViewCell. The Time Profiler instrument tells me that I'm spending most ...