We’ve made a lot of improvements to our image decompression algorithms over the last few years. This allows Qoppa’s PDF libraries and components to open, render and print all types of images (JBIG2, CCIT Fax, JPEG, …) contained in PDF documents very reliably and in a very efficient way. Unfortunately, there is still a hurdle […]
Articles Tagged: JPEG2000
Definition of the jPEG2000 Quality parameter in jPDFOptimizer
Q: How is the quality parameter defined when using JPEG2000 compression in jPDFOptimizer? This is the sample code I am using to compress existing images to JPEG2000 within PDF documents using jPDFOptimizer. imageoutput.setCompression(ImageOutput.CO_JPEG2000); imageoutput.setCompressionQuality(0.8f);imageoutput.setCompression(ImageOutput.CO_JPEG2000); imageoutput.setCompressionQuality(0.8f); The quality setting for JPEG200 compression is used to calculate the data rate (bits per pixel). The range for this […]
How to set the quality parameter when optimizing PDFs using JPEG or JPEG2000 compression
Q: We are using jPDFOptimizer, your Java library to optimize PDF documents. We are getting inconsistent results when compressing using JPEG2000 with the quality parameter. Sometimes the images are well compressed with a quality of 0.8, sometimes we have to use a quality of 0.2 for what appears to be the same results. A: This […]
