If a pdf contains a single-image (singleimage=true) or a single image with ocr text, how does pdfrasterize create the atalasoft image? Does it know enough to just extract the image? What I am interested in knowing is will pdfraster be more efficent on single image pdf (like using extractedimages()) vs a vector pdf? We have pdfs that are a mix of single images w/ and w/o ocr and vector pages and I wanted to know if it would be better to check each page and decide whether extract the image or rasterize it or just pdfrasterize it.

DotImage PDFRasterizer will extract the embedded image and resample the image based on the requested resolution when singleimage=true.  If the original image was bitonal, the result when rasterizing is likely to be grayscale due to resampling.  Depending on what you need, you might want to extract the image yourself when singleimage = true if you don't care about the resolution.

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Bill Bither
Atalasoft