Re-compressing jpg's for upload?
Hi, I’ve created 117 8×10 inch pages in InDesign and then exported them as 300dpi high-quality jpg’s of 2370×3000 pixels. Next I placed the 117 InDesign images/pages in an 8×10 inch portrait book with the BookSMart software. Lastly I succesfully uploaded the entire book. To my surpise only about 170MB was transferred during the upload although my 117 exported InDesign pages are about 450MB. What happened? Does the software re-compress these 300dpi jpg’s for the upload? The size of the ".original" files in the library are about 450MB as well. And secondly, where can I find the "altered" images that are finally uploaded? Thanks in advance, Richard
|
|
|
Hi Richard, Yes, compression indeed occurs upon upload. Those compressed images are only in the book file being printed, and aren’t stored on your computer. I believe that due to the care you took creating the files and the quality of the compression we use, your pages should look great in print. Best regards,
Jeremy
|
|
|
Jeremy, Thanks for Your reply. I’ll just wait and see… Best regards, Richard
|
|
|
Hi Jeremy, could you elaborate as to HOW the compression is done? Lossless or lossy? JPG is already a lossy filetype, so, are the files being processed again in a lossy way? Thanks, Nik
|
|
|
Hi Nik, Our QA engineers tell me we indeed use high quality JPG compression, as its the best way to ensure that authors are able to upload large book files. They add that anyone who is concerned about that can better control output by resizing their images to the pixel dimensions recommended by the image frames in BookSmart. That way, no downsampling wil take place (images above 300dpi will be downsampled to 300dpi upon upload). And, if you’re working from a RAW file or creating a custom page, saving your file as a PNG will prevent any loss of quality on the front end. Hope that helps! Best regards,
Jeremy
|
|
