Tagged Questions
-1
votes
0answers
25 views
Créate a JFIF header for jpeg DATA compressed (AC DC coefficients) [closed]
i créate an algorithme for jpeg compression for color image with language MATLAB,
i used tables (for groupe jpeg) to code DC and AC elements, finally i have 6 binary vectors
vect_dc_r,
vect_dc_v,
...
1
vote
1answer
65 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
2answers
2k views
How to compress / reduce the size of JPEG photos for archiving?
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
557 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
726 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
74 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 ...
2
votes
3answers
274 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
171 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
491 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
2k views
Tool for compressing data in JPEG lossless format
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
267 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, ...
