I am trying to draw a line on an UIImage with the help of a dataBuffer when a button gets touched, but the drawRect: .. methode doesn´t get called. (so, the line i want to draw does\'t appear)
i\'m trying to create UIImage from the sampleBufferData and here what i have in the console : CGBitmapContextCreate: invalid data bytes/row: should be at least 1920 for 8 integer bits/component, 3 co
I have an image that is totally white in its RGB components, with varying alpha -- so, for example, 0xFFFFFF09 in RGBA format.But when I load this image with either UIImage or CGImage APIs, and then d
I try to resize image with aspect ratio, like done in the following links Resizing UIimages pulled from the Camera also ROTATES the UIimage?
I develop an iOS app with user-drawing as one of its parts. I want to draw over a bitmap\'s context. This can be implemented in two ways:
In my application I need to resize and crop some images, stored locally and online. I am using Trevor Harmon\'s tutorial which implements UIImage+Resize.
I would like to create an image of my own. I already k开发者_如何学JAVAnow its width (320*2 = 640) and height (427).
I\'m trying to change color of an image in a background thread. Apple doc says UIGraphicsBeginImageContext can only be called from main thread, and I\'m trying to use CGBitmapContextCreate:
I\'ve been at this for hours now, and don\'t even know how to debug this error. Maybe there\'s an SO expert who knows what\'s going on.
I have a PNG image that开发者_JS百科 has an unsupported bitmap graphics context pixel format. Whenever I attempt to resize the image, CGBitmapContextCreate() chokes on the unsupported format
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