ios – ImageMagick如何编写代码以在图像上应用ShepardsDistortion

我是ImageMagick的新手，我想在源图像上开发ShepardsDistortion的效果。 我经历了很多post和网站，但我没有找到在iOS中实现“ShepardsDistortion”的方法。

MagickWand *mw = NewMagickWand(); MagickSetFormat(mw, "png"); UIImage *sourceImage=[_sourceImgView image]; NSData *imgData=UIImagePNGRepresentation(sourceImage); MagickReadImageBlob(mw, [imgData bytes], [imgData length]); Image *image=GetImageFromMagickWand(mw); DistortImage(image, ShepardsDistortion, , ,); 

我做到了这一点，但我不知道在DitortImage（）中传递什么作为arg。 所以，如果有人知道然后帮助我。

编辑：

 -(void)distortImage{ MagickWandGenesis(); MagickWand * wand; MagickBooleanType status; wand = NewMagickWand(); MagickSetFormat(wand, "png"); status = MagickReadImage(wand,"chess.png"); // Arguments for Shepards double points[8]; points[0] = 250; // First X point (starting) points[1] = 250; // First Y point (starting) points[2] = 50; // First X point (ending) points[3] = 150; // First Y point (ending) points[4] = 500; // Second X point (starting) points[5] = 380; // Second Y point (starting) points[6] = 600; // Second X point (ending) points[7] = 460; // Second Y point (ending) MagickDistortImage(wand,ShepardsDistortion,8,points,MagickFalse); NSString * tempFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"out.png"]; MagickWriteImage(wand,[tempFilePath cStringUsingEncoding:NSASCIIStringEncoding]); UIImage * imgObj = [UIImage imageWithContentsOfFile:tempFilePath]; _resultImgView.image=imgObj; // // unsigned char * cBlob; // size_t data_size; // cBlob = MagickGetImageBlob(wand, &data_size); // NSData * nsBlob = [NSData dataWithBytes:cBlob length:data_size]; // UIImage *uiImage = [UIImage imageWithData:nsBlob]; // _resultImgView.image=uiImage; MagickWriteImage(wand,"out.png"); wand=DestroyMagickWand(wand); MagickWandTerminus(); } 

Answer 1

参数作为双精度列表的开头和列表的大小信息传递给DistortImage。 例：

 size_t SizeOfPoints = 8; double Points[SizeOfPoints]; DistortImage(image, ShepardsDistoration, SizeOfPoints, Points, MagickFalse, NULL ); 

在你的例子中，你似乎在混合MagickWand和MagickCore方法; 这似乎是不必要和令人困惑的。 我会保持这种失真简单，只使用MagickWand的MagickDistortImage方法。 这是c中的一个例子

 int main(int argc. const char **argv) { MagickWandGenesis(); MagickWand * wand; MagickBooleanType status; wand = NewMagickWand(); status = MagickReadImage(wand,"logo:"); // Arguments for Shepards double points[8]; // 250x250 -> 50x150 points[0] = 250; // First X point (starting) points[1] = 250; // First Y point (starting) points[2] = 50; // First X point (ending) points[3] = 150; // First Y point (ending) // 500x380 -> 600x460 points[4] = 500; // Second X point (starting) points[5] = 380; // Second Y point (starting) points[6] = 600; // Second X point (ending) points[7] = 460; // Second Y point (ending) MagickDistortImage(wand,ShepardsDistortion,8,points,MagickFalse); MagickWriteImage(wand,"out.png"); wand=DestroyMagickWand(wand); MagickWandTerminus(); return 0; } 

导致扭曲的翻译图像（ 细节 ）

编辑

对于iOS，您可以使用NSTemporaryDirectory （如本答案中所述 ），或使用NSData动态创建图像（如本问题所示 ）。

临时路径示例：

 NSString * tempFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"out.png"]; MagickWriteImage(self.wand, [tempFilePath cStringUsingEncoding:NSASCIIStringEncoding]); UIImage * imgObj = [UIImage imageWithContentsOfFile:tempFilePath]; 

以及NSData + blob的示例

 unsigned char * cBlob; size_t data_size; cBlob = MagickGetImageBlob(wand, &data_size); NSData * nsBlob = [NSData dataWithBytes:cBlob length:data_size]; UIImage * uiImage = [UIImage imageWithData:nsBlob]; 

Answer 2

这可能有所帮助：

 MagickWandGenesis(); magick_wand = NewMagickWand(); double points[24]; points[0] = 250; points[1] = 250; points[2] = 50; points[3] = 150; points[4] = 0; points[5] = 0; points[6] = 0; points[7] = 0; points[8] = self.frame.width; points[9] = 0; points[10] = self.frame.width; points[11] = 0; points[12] = self.frame.width; points[13] = self.frame.height; points[14] = self.frame.width; points[15] = self.frame.height; points[16] = self.frame.width; points[17] = self.frame.height; points[18] = self.frame.width; points[19] = self.frame.height; points[20] = 0; points[21] = self.frame.height; points[22] = 0; points[23] = self.frame.height; NSData * dataObject = UIImagePNGRepresentation([UIImage imageNamed:@"Imagemagick-logo.png"]);//UIImageJPEGRepresentation([imageViewButton imageForState:UIControlStateNormal], 90); MagickBooleanType status; status = MagickReadImageBlob(magick_wand, [dataObject bytes], [dataObject length]); if (status == MagickFalse) { ThrowWandException(magick_wand); } // posterize the image, this filter uses a configuration file, that means that everything in IM should be working great status = MagickDistortImage(magick_wand,ShepardsDistortion,24,points,MagickFalse); //status = MagickOrderedPosterizeImage(magick_wand, "h8x8o"); if (status == MagickFalse) { ThrowWandException(magick_wand); } size_t my_size; unsigned char * my_image = MagickGetImageBlob(magick_wand, &my_size); NSData * data = [[NSData alloc] initWithBytes:my_image length:my_size]; free(my_image); magick_wand = DestroyMagickWand(magick_wand); MagickWandTerminus(); UIImage * image = [[UIImage alloc] initWithData:data]; [data release]; [imageViewButton setImage:image forState:UIControlStateNormal]; [image release];