cgimage

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Getting 0 values for RGB when trying to change pixels in an CGImageRef data

Hi guys I am getting 0 for RGB values in this code. Any idea why? The inImage was created with this CGContext.[详细]

2023-01-27 05:41 分类：问答
Proper use of MKOverlayView

I am writing an iPhone app in which I place a large PNG image (1936 × 2967) on an MKMapView using MKOverlayView. I am a little confused about how to appropriately implement the drawMapRect: functio[详细]

2023-01-24 18:49 分类：问答
Memory issue using CGImage.ScreenImage and UIImagePickerController Mono Touch

I\'m trying to create an IP Camera application for iPhone using mono touch. To get the camera feed, I call the CGImage.ScreenImage method continuously and convert the resulting UIImage into a byte arr[详细]

2023-01-24 03:27 分类：问答
How to grab an image of an offscreen NSWindow?

I\'m trying to get 开发者_如何转开发an image of an offscreen window to use in a CALayer-based animation, but no matter which method I try I cannot get an image out the other side. Here is the code I\'[详细]

2023-01-22 21:51 分类：问答
UIImage or CGImage is preferred?

I have a UIView with UIImageView as its subview and i need to change the image in that view while the user开发者_开发百科 swipe it.[详细]

2023-01-22 16:43 分类：问答
Converting CVImageBufferRef to PNG

I want to write all frames to disk using QTKit.framework for camera input. But all the images I get are half transparent and without some colors, maybe colorspace problem? ;([详细]

2023-01-21 16:09 分类：问答
how to save an image with text on another image?

I any one have idea about taking snapshot from iphone application through coding. means. I am developing an iphone application where there will be two images dynamically comes. There will be a text[详细]

2023-01-19 19:33 分类：问答
PicHandle to CGImageRef

This project is a generic C++ plugin with core-graphics support. I am unable to convert a PicHandle to CGImageRef successfully. Saving off image from CFDataRef results in a bad image.[详细]

2023-01-18 12:36 分类：问答
Multiplying RGBA with two CGImageRefs

I\'d like to multiply r, g, b and a values of two CGImages, to use a single image as both a mask (in its alpha channel) and tint (in the rgb channels). I first tried simply:[详细]

2023-01-16 15:07 分类：问答
Draw part of CGImage

I have an application that draws images from a CGImage. The CImage itself is loaded using a CGImageSourceCreateImageAtIndex to create an image from a PNG file.[详细]

2023-01-13 05:09 分类：问答