0
votes
2answers
44 views

How can I achieve the maximum zip compression? [closed]

I would like to make a "standard" zip file which contain .jpg images. Which software and switches / options should I use to achieve the maximum compression ratio? I mean maybe I can make a solid ...
1
vote
1answer
84 views

Most space-efficient format for image with large dimensions but few colors?

Recently I have had to scale up the dimensions of a gif image by a factor of 2, this resulted in an increase of the file size by about 8 times. While this is not a complete surprise, I can't help but ...
0
votes
3answers
4k views

How to compress / reduce the size of JPEG photos for archiving? [closed]

I have 50,000 high resolution JPEG photos, where a couple of them might occasionally be needed, about once a year. I wanted to zip them to save disk space, except that zipping gives no space benefit ...
7
votes
2answers
2k views

Progressive JPEG quality compare to normal JPEG?

I'm trying to convert some BMP files into JPEG format at highest quality (Q = 100) until I realize there is a "Progressive" option here. One of my BMP file is 2.9MB. After converting to JPEG format ...
3
votes
2answers
2k views

jpeg: reduce picture size without changing resolution and quality

I'm trying to reduce file size of a bunch of JPEG files, say 1280x720. Without changing the resolution and the visual quality much, what are the recommended approach?
2
votes
1answer
139 views

JPG compression setting for consumer-quality vacation photos?

When I'm saving a JPG file, Paint Shop Pro (Windows) and Gimp (Linux) show a pop-up to choose the JPG compression level. The apps have something like 85 as default value, and I think reducing the ...
3
votes
4answers
573 views

Losslessly compressing similar images?

I need to reduce the size of my photo library so I naturally want to compress them. Many of them are not quite identical, but still very similar (subsequent shots of the same scene). Is there any ...
5
votes
3answers
238 views

Arrange JPG images based on JPG compression/quality

I have been looking for a way to arrange JPG images based on the quality/compression level of the images. I want to do this so that I could select only those images which has less compression (let’s ...
1
vote
1answer
609 views

Does iPhoto do lossless JPEG cropping?

If I crop a JPEG photo in iPhoto and then export it as JPEG, is the exported version re-compressed a second time, or does iPhoto somehow crop without re-encoding, thus avoiding further image ...
2
votes
4answers
3k views

Tool for compressing data in JPEG lossless format [closed]

I have a file which contains raw pixel data and I want to compress this data using JPEG lossless compression. I tried to search for this tool using google but couldn't fina any. Does anybody know here ...
1
vote
4answers
322 views

Scanned JPEGs are large and slow to load - can they be optimized losslessly?

I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, ...