How to resample pdf images to compress pdf size?

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   How to resample pdf images to compress pdf size? I extracted one by one image on disk, downsize the quality of JPG using image processing library then replaces the existing image with new one. After that, the file size get increased instead of going to down. Please assist the best way to reduce file size by downsizing the image quality.
Thanks in advance.

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ExchangeViews Members Profile Find Members Posts Team Player Joined: 13 Mar 12 Status: Offline Points: 38	Post Options Post Reply Quote ExchangeViews Report Post Thanks(0) Quote Reply Topic: How to resample pdf images to compress pdf size? Posted: 28 May 13 at 8:24AM
	How to resample pdf images to compress pdf size? I extracted one by one image on disk, downsize the quality of JPG using image processing library then replaces the existing image with new one. After that, the file size get increased instead of going to down. Please assist the best way to reduce file size by downsizing the image quality. Thanks in advance.

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 29 May 13 at 2:03PM
	We would need to see your code and the PDF to understand what could be happening. Andrew.

ExchangeViews Members Profile Find Members Posts Team Player Joined: 13 Mar 12 Status: Offline Points: 38	Post Options Post Reply Quote ExchangeViews Report Post Thanks(0) Quote Reply Posted: 01 Jun 13 at 6:31AM
	Dear Andrew thanks for reply. Here is the code i m using: for J := 1 to ImgCOunt do Begin ImgID:= QP.GetImageID(J); QP.SelectImage(ImgID); if QP.ImageType = 1 then Begin QP.SaveImageToFile('F:\temp.jpg'); ObjImage.IO.LoadFromFileAuto('F:\temp.jpg'); ObjImage.IO.Params.JPEG_Quality:= 40; ObjImage.IO.SaveToFileJpeg('F:\temp.jpg'); QP.ReplaceImage(ImgID, QP.AddImageFromFile('F:\temp.jpg',0)); End; End; QP.SaveToFile('F:\new.pdf'); Is this correct way of reducing the image size? Is there any memory still present in pdf which is increasing file size. Please help me. Thanks in advance.

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 04 Jun 13 at 3:51AM
	Have you tried calling QP.ClearImage(ImageID); which will mostly remove the original image. This line should go after the call to QP.ReplaceImage. Are you also calling QP.CompressImages(1) at the start of your code. Andrew.