PeachPDF
PeachPDF.PdfGenerateConfig
PdfGenerateConfig.DownscaleQuality Property
The JPEG quality (0-100) used when DownscaleImages actually resizes an image
that has no real alpha channel (and so would be JPEG-encoded anyway). Has no effect on
full-resolution JPEG embeds, and never applies to images with real transparency - those stay
on the lossless embed path regardless of downscaling, just resized. Defaults to 70.
public int DownscaleQuality { get; set; }