Legacy ImageMagick Discussions Archive

I am doing this in-memory with the MagickCore interface. I need to determine an image type from the raw bytes before calling BlobToImage

In order to speed up my image processing, I use the jpeg:size hint to give the JPEG decoder more efficiency. However, I don't want to do this blindly. How can I detect an image type from the raw bytes before calling BlobToImage? I could write code to inspect the header, but I think Imagemagick ...

Thanks for the hint. Both of the following appear to work: SetImageOption(original_image_info, "jpeg:size", "800x800"); DefineImageOption(original_image_info,"jpeg:size=800x800"); There are many ways to skin a cat.

I am resizing JPEGs, programatically with the MagickCore interface. I note with the convert command that passing a size hint dramatically speeds up the resize: convert -define jpeg:size=800x800 -resize=800x800 balloon.jpg b.jpg I would like to pass this in to my MagickCore code, but I do not see how ...