nsimage

问题 Is there a way I can change the color space of an NSimage or NSBitmapImageRep/CGimage or the like. I am open to any way. Preferably the way photoshop does it. 回答1: CGImageRef CGImageCreateCopyWithColorSpace ( CGImageRef image, CGColorSpaceRef colorspace ); To get a CGColorSpaceRef, you can do things like CGColorSpaceRef CGColorSpaceCreateDeviceRGB(); OR see this page for how to create other color spaces. 回答2: The problem with the code you see below CGImageRef CGImageCreateCopyWithColorSpace (

问题 I have a large 1D dynamic array in my program that represents a FITS image on disk i.e. it holds all the pixel values of the image. The type of the array is double . At the moment, I am only concerned with monochrome images. Since Cocoa does not support the FITS format directly, I am reading in the images using the CFITSIO library. This works - I can manipulate the array as I wish and save the result to disk using the library. However, I now want to display the image. I presume this is

问题 I'm trying to flip an NSImage created with a NSImageBitmapRep representation. After some digging (Flipping Quicktime preview & capture and Mirroring CIImage/NSImage) I tried two ways via a CIImage and applying a scaling transformation with -1 for both factors. First using CIImage imageByApplyingTransform: NSBitmapImageRep *imgRep = ... CGImageRef cgi = [imgRep CGImage]; CIImage *cii = [CIImage imageWithCGImage:cgi]; CGAffineTransform at = CGAffineTransformTranslate(CGAffineTransformMakeScale(

问题 I need to change the resolution of the existing image in objective-c just like Apple's Preview application Tools->Adjust Size...->Resolution. Please let me know the possible solutions. 回答1: Here's a great sample I've used - http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/ From that sample, you can write resizedData to the file - and this will be a resized output in tiff format. UPDATE: here comes the NSImage category implementation, that allows to save NSImage instance with

问题 Is there any way to draw an NSImage like images in NSButtons or other cocoa interface elements? Here are examples: Apple uses pdf's with black icons: 回答1: If you simply want this effect to be applied when you use your own images in a button, use [myImage setTemplate:YES] . There is no built-in way to draw images with this effect outside of a button that has the style shown in your screenshots. You can however replicate the effect using Core Graphics. If you look closely, the effect consists

问题 Is there an easy way to do this that works in 10.5? In 10.6 I can use nsImage CGImageForProposedRect: NULL context: NULL hints: NULL If I'm not using 1b black and white images (Like Group 4 TIFF), I can use bitmaps, but cgbitmaps seem to not like that setup... Is there a general way of doing this? I need to do this because I have an IKImageView that seems to only want to add CGImages, but all I've got are NSImages. Currently, I'm using a private setImage:(NSImage*) method that I'd REALLY

问题 while working with OpenCV I need to convert a NSImage to an OpenCV multi-channel 2D matrix (cvMat) and vice versa. What's the best way to do it? Greets, Dom 回答1: Here's my outcome, which works pretty well. NSImage+OpenCV.h: // // NSImage+OpenCV.h // #import <AppKit/AppKit.h> @interface NSImage (NSImage_OpenCV) { } +(NSImage*)imageWithCVMat:(const cv::Mat&)cvMat; -(id)initWithCVMat:(const cv::Mat&)cvMat; @property(nonatomic, readonly) cv::Mat CVMat; @property(nonatomic, readonly) cv::Mat

问题 while working with OpenCV I need to convert a NSImage to an OpenCV multi-channel 2D matrix (cvMat) and vice versa. What's the best way to do it? Greets, Dom 回答1: Here's my outcome, which works pretty well. NSImage+OpenCV.h: // // NSImage+OpenCV.h // #import <AppKit/AppKit.h> @interface NSImage (NSImage_OpenCV) { } +(NSImage*)imageWithCVMat:(const cv::Mat&)cvMat; -(id)initWithCVMat:(const cv::Mat&)cvMat; @property(nonatomic, readonly) cv::Mat CVMat; @property(nonatomic, readonly) cv::Mat

问题 How can I save a NSImage as a new file (png, jpg, ...) in a certain directory? 回答1: Do something like this: NSBitmapImageRep *imgRep = [[image representations] objectAtIndex: 0]; NSData *data = [imgRep representationUsingType: NSPNGFileType properties: nil]; [data writeToFile: @"/path/to/file.png" atomically: NO]; 回答2: You could add a category to NSImage like this @interface NSImage(saveAsJpegWithName) - (void) saveAsJpegWithName:(NSString*) fileName; @end @implementation NSImage

问题 Currently I have the following CIImage *img = [CIImage imageWithCVImageBuffer: imageBuffer]; NSCIImageRep *imageRep = [NSCIImageRep imageRepWithCIImage:img]; NSImage *image = [[[NSImage alloc] initWithSize: [imageRep size]] autorelease]; [image addRepresentation:imageRep]; This works perfectly, I can use the NSImage and when written to a file the image is exactly how I need it to be. However, I'm pulling this image from the users iSight using QTKit, so I need to be able to flip this image