cgbitmapcontext

Black and White graphics context

I'm working in Quartz/Core-graphics. I'm trying to create a black and white, 1b per pixel graphics context. I currently have a CGImageRef with a grayscale image (which is really black and white). I want to draw it into a black and white BitmapContext so I can get the bitmap out and compress it with CCITT-group 4. (For some reason Quart...

App using MonoTouch Core Graphics mysteriously crashes

My app launches with a view controller and a simple view consisting of a button and a subview. When the user touches the button, the subview is populated with scrollviews that display the column headers, row headers, and cells of a spreadsheet. To draw the cells, I use CGBitmapContext to draw the cells, generate an image, and then put th...