save « graphics « iPhone iPad Media Q&A

1. Saving and restoring CGContext    stackoverflow.com

I'm trying to save and restore cgcontext to avoid doing heavy drawing computations for a second time and I'm getting the error : CGGStackRestore: gstack underflow. What am I doing wrong? ...

2. Is it possible to save an image with Core Graphics on the iPhone?    stackoverflow.com

The following code converts a PDF page into a JPEG. It runs as expected on Snow Leopard:

...
//get the image from the bitmap context
CGImageRef image = CGBitmapContextCreateImage(outContext);

//create the output destination
CGImageDestinationRef outfile = ...

3. How can I save a Bitmap Image, represented by a CGContextRef, to the iPhone's hard drive?    stackoverflow.com

I have a little sketch program that I've managed to throw together using Quartz2D, but I'm very new to the iOS platform and I'm having trouble figuring out how to allow ...

4. Problems saving PDF files in iOS4    stackoverflow.com

I want to have my iPhone application create a PDF file and store it in an appropriate place - probably the iBooks folder so it can be easily retrieved using iTunes, ...

5. CG change/saving context when drawing a subpath    stackoverflow.com

If I am doing a simple drawing, and I want to change the line width/dash of certain sub paths, how can I achieve this without changing all the paths? I ...

6. Quantize Image, Save List of Remaining Colors    stackoverflow.com

Is there a library I can use that will allow me to quantize images on an iPhone? I want to quantize the images down to maybe 8 colors and record either hex ...

7. How to save drawing without its background?    stackoverflow.com

Currently i am trying to draw some line in my iPad screen and i am able to do so. I am following this code: iPad (very) simple drawing So currently if i am ...