pdfGetImageInfo
Get information about an image.
void pdfGetImageInfo(PDFHandle pdf, int idx,
int *mask, int *colorSpace,
int *width, int *height)
This function retrieves information about
the
idxth image on the page specified in the
last call to pdfGetImages.
The following information is returned:
maskis a boolean flag, set to 1 for image masks and 0 for images - in PDF files, an "image mask" is a monochrome image which is drawn with the current fill color; the image mask itself does not include any color information (just opaque and transparent pixels).colorSpaceis an integer indicating the color space type used by the image - seepdfGetNumColorSpacesandpdfGetColorSpaceNamefor information on color space types. Image masks have no color information, so the colorSpace value is undefined and should be ignored ifmaskis 1.widthandheightdefine the size of the image, in pixels - this is the size of the raw image data found in the PDF file; the image may be scaled up or down (and cropped, rotated, sheared, etc.) when it is displayed on the page.
C:
int nImgs, i, mask, colorSpace, w, h;
/* scan images on page 1 */
pdfGetImages(pdf, 1);
nImgs = pdfGetNumImages(pdf);
for (i = 0; i < nImgs; ++i) {
pdfGetImageInfo(pdf, i, &mask, &colorSpace, &w, &h);
printf("image %d: %s %d x %d colorSpace=%s\n",
i, mask ? "mask" : "image", w, h,
pdfGetColorSpaceName(colorSpace));
}