Works, but isn't the most efficient way if you know that Ghostscript can do PDF => PNG in one go. So how does IM get (E)PS from your PDF? Easy: convert -list delegate | findstr /i PDFĪh! It uses Ghostscript to make a PDF => PS conversion, then uses Ghostscript again to make a PS => PNG conversion. You'll discover that IM does produce PNG only from PS or EPS input. If you are on Linux, try this: convert -list delegate | grep -i png (On my system that's a list of 32 different commands.) Now to see which commands are used to convert to PNG, use this: convert -list delegate | findstr /i png You can learn about the detailed settings ImageMagick's "delegates" (external programs IM uses, such as Ghostscript) by typing convert -list delegate The density will not affect the resize and waits to be set until the image is written out.What are best parameters to run ImageMagick to convert low quality pdf to images (for OCR) However, I try to do things in linear, logical order as appropriate to proper syntax. You should remove all meta data that you want before resizing (for efficiency), then set the density and quality.Ĭonvert input.jpg/jpeg/tiff/png/tif -verbose -strip -resize 1200x1200 -quality 75 -density 72x72 -units pixelsperinch output.jpgĭensity does not apply until the end as does -quality (after the resize), but the placement should not matter. Second question is, On what order the command is executed, what i mean is, first it will reduce the DPI to 72 then resize it to 1200x1200 and then change the quality or is it follow any different order the reason why i am asking is if we follow different order then there is change of changing the pixels size. My first question is, The command which i am using is correct or not and Helloworld wrote:I am trying to execute a command like below to change the DPI, Resize, Quality and removing profile and commentĬonvert input.jpg/jpeg/tiff/png/tif -density 72 -verbose -resize 1200x1200 -quality 75 +profile "*" +comment output.jpg
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