cgimage

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How exactly to make a CGImageRef from an image on disk

I\'ve looked around everywhere to no avail. I\'m doing some image loading in a thread and since UIKit i开发者_运维百科s not thread safe I\'m going to have to store the images as CGImageRefs but I can\[详细]

2023-01-12 14:15 分类：问答
What framework needs to be imported to use CGImage?

So I have an app that gets pixel data from a picture and then manipulates to change brightness levels via R开发者_StackOverflowGB values of each pixel.[详细]

2023-01-11 00:04 分类：问答
Getting resolution from a CGImageRef

I\'m creating a CGImageRef out of, in one case, a TIFF file, through a CGImageSource, in another case raw bitmap data via a CGDataProvider and in another case, from a PDFPage via an NSImage. I need to[详细]

2023-01-10 15:55 分类：问答
CGBitmapContextCreateImage - vm_copy failed - iPhone SDK

I am having an issue using CGBitmapContextCreateImage in my iPhone app. I am using AV Foundation Framework to grab camera frames using this method:[详细]

2023-01-09 06:26 分类：问答
Getting into pixel data of NSImage

I\'m writing application that operates on black&white images. I\'m doing it by passing a NSImage object into my method and then making NSBitmapImageRep from NSImage. All works but quite slow. Here[详细]

2023-01-08 05:44 分类：问答
what is resolution of photo taken by iPhone 4 camera?

In specs, iPhone 4 screen resolution & pixel density * iPhone 4 has a screen resolution of 960×640 pixels, which is twice that of[详细]

2023-01-08 04:55 分类：问答
Working with images (CGImage), exif data, and file icons

What I am trying to do (under 10.6).... I have an image (jpeg) that includes an icon in the image file (that is you see an icon based on the image in the file, as opposed to a generic jpeg icon in fi[详细]

2022-12-31 04:29 分类：问答
Length of data returned from CGImageGetDataProvider is larger than expected

I\'m loading a grayscale png image and I want to access the underlying pixel data. However after I load get the pixel data via CGImageGetDa开发者_StackOverflow中文版taProvider, the length of the data[详细]

2022-12-30 18:42 分类：问答
Convert bitmap image information into CGImage in iPhone OS 3

I want to create a CGImage with the color information I already have Here is the code for converting the CGImage to CML, CML_color is a matrix structure[详细]

2022-12-30 07:34 分类：问答
Fatsest way to edit alpha of CGImage (or UIImage) with touch and then display?

I have two image views, one on top of the another, with two different images. As the user t开发者_高级运维ouches the image and moves his/her finger, the top image should become transparent along the t[详细]

2022-12-30 03:57 分类：问答