Resize Photo Help
Posted: 2009-05-31T03:07:05-07:00
I am implementing a funcion using MagickCore to resize the photo which are uploaded by uesrs to 3 sizes, 400x600,200x300,100x150. I write the code as follow:
But according to the increase of users, the speed of resize images should be improved. I found that most of photos are jpg format, and for jpg files, it seems that we can directly convert it to N/8 sizes(N=1,2,4). The problem I met is I don't know which API I should use to directly convert to 8/N size. could anyone give me some helps? I tried the following code which can archive what I want, but I don't know whether it is correct.
Code: Select all
char *blob = xxxxx //get from http request
size_t length = xxxx//get from http request
ImageInfo *blob_info = CloneImageInfo((ImageInfo *)NULL);
Image *blob_image = BlobToImage(blob_info, blob, length, exception);
Image *resize_image1 = ResizeImage(image, 400, 600, LanczosFilter, 1.0, exception);
Image *resize_image2 = ResizeImage(image, 200, 300, LanczosFilter, 1.0, exception);
Image *resize_image3 = ResizeImage(image, 100, 150, LanczosFilter, 1.0, exception);Code: Select all
char *blob = xxxxx //get from http request
size_t length = xxxx//get from http request
ImageInfo *blob_info = CloneImageInfo((ImageInfo *)NULL);
Image *blob_image = BlobToImage(blob_info, blob, length, exception);
Image *resize_image1 = ResizeImage(image, 400, 600, LanczosFilter, 1.0, exception);
size_t new_length = 0;
char *new_blob = ImageToBlob(blob_info, resize_image1, new_length, exception);
char size[10] = "200x300";
blob_info->size = malloc(strlen(size)+1);
strcpy(blob_info->size, size);
Image *resize_image2 = BlobToImage(blob_info, new_blob, new_length, exception);
strcpy(blob_info->size, "100x150");
Image *resize_image3 = BlobToImage(blob_info, new_blob, new_length, exception);