19 votes
Accepted

Two EXACTLY the same .jpg images with one image more than twice the file size of the other - Why? (PART 2)

The big file contains very bulky metadata that seem related to "Document Ancestors" (whatever that means), as demonstrated using exiftool(*): Small file: <...
xenoid's user avatar
  • 21.4k
5 votes

Something is corrupting my jpegs. How can I trace what did this?

In general, you cannot determine which application last changed a file (whatever the file, image, spreadsheet...). You can have a clue that the file has been changed by an application because usually ...
xenoid's user avatar
  • 21.4k
5 votes

A JPEG image EXIF Orientation problem

The problem here is that whatever program wrote the Orientation tag wrote it in the wrong place. It is supposed to be in the ...
StarGeek's user avatar
  • 3,803
4 votes

Edit an image's data so that a digital camera can read it

jpeg is a container format like tiff, and the mpeg formats so there are various options which probably aren't implemented in ...
James Snell's user avatar
  • 9,709
3 votes

Metering Mode Doesn't Effect RAW Files? What About The JPEG Preview?

...would it be correct to say that while the metering mode does not affect the RAW files directly, different modes could lead me to use different manual settings which would affect the RAW image? Yes,...
inkista's user avatar
  • 52.1k
2 votes

propritery SANYO metadata

The Exif specification allows for manufacturer-specific data, stored as "MakerNote" data. I'm not quite sure what you mean by an invisible pixel, but there's no need to jump through strange ...
osullic's user avatar
  • 12.1k
2 votes

Auto (or manual) renaming of various JPG files

Using exiftool, you would use this command to prefix the date time to the file name ...
StarGeek's user avatar
  • 3,803
2 votes
Accepted

Which JPG has better quality? And which Exif Byte Order is better?

I don't think there's any perceivable difference. Visually they seem identical, even at extreme zoom. There are some minor & unimportant differences in the metadata. The dotted line here is where ...
Tetsujin's user avatar
  • 23.3k
1 vote

How best to convert PNG to WebP

Forget door number 3. There is no sense in converting to JPG and then to Webp. But most importantly: You can not reduce from 50Mb to 100k and expect that image to be useful for print. The logic is ...
Rafael's user avatar
  • 24.8k
1 vote

Metering Mode Doesn't Effect RAW Files? What About The JPEG Preview?

However, when I've done some testing it does seem to affect the JPEG preview image that appears on the screen, and the histogram derived from that image. There is absolutely no reason the metering ...
Steven Kersting's user avatar
1 vote

Metering Mode Doesn't Effect RAW Files? What About The JPEG Preview?

The short answer is yes, your settings absolutely affect the raw image file that is saved. The long answer is that speed, aperture, and ISO don't only affect image brightness and contrast. Speed also ...
emmit's user avatar
  • 495
1 vote

Apple Preview vs. GIMP, Photoshop, Bridge etc. as PNG/TIFF to JPEG converter

Let me divide this into several parts. 1. JPG JPG is a standardized file format. It has a clear specification. So what I mean, is that there is not much under the hood that "specialized" ...
Rafael's user avatar
  • 24.8k
1 vote

Apple Preview vs. GIMP, Photoshop, Bridge etc. as PNG/TIFF to JPEG converter

Cropping is your stumbling block. There's already a question here covering that, though - Automatic & intelligent crop 1,000 images. Preview doesn't do profile conversion at all, which is OK if ...
Tetsujin's user avatar
  • 23.3k
1 vote

Auto (or manual) renaming of various JPG files

At the risk of sounding like a broken record, I'm going to suggest IMatch (photools.com). I use Bulk Rename Utility for lots of other things, and I love it. But it didn't turn out to be as powerful ...
GrantRobertson's user avatar
1 vote

Auto (or manual) renaming of various JPG files

Bulk Rename Utility is one of my favorite pieces of software. I'd never used this specific feature until just now, but it has the ability to read EXIF data as well to use date taken in renaming. It ...
ickybus's user avatar
  • 111
1 vote

Which JPG has better quality? And which Exif Byte Order is better?

Using ImageMagick you can compare the image data (see ImageMagick Image Similarity Comparison). Using a command such as ...
StarGeek's user avatar
  • 3,803
1 vote

How do you identify file type/compression in a TIFF file?

As others have pointed out, compression per se does not mean a lossy photo. The TIFF format supports a variety of compression algorithms. Only one of them (JPEG) is lossy; the others like LZW, ZIP, ...
Binarus's user avatar
  • 111
1 vote

How to recover the orginal name of picture file .JPG made by device?

Building on xiota's answer, most Nikon cameras store a file sequence number in the EXIF data which matches the original filename. What you'll find in the EXIF is something called Image Number. In this ...
Foliovision's user avatar
1 vote

How can I add a border to a JPEG photo without affecting quality?

If PDF is an option, you can avoid the bloat of converting it a lossless format. img2pdf will embed JPEG, JPEG2000 and PNG files into a PDF file without re-encoding them (unlike all mainstream PDF ...
Tim's user avatar
  • 11
1 vote

What quality to choose when converting to JPG?

It's often more efficient to reduce the size of the image than the quality, especially if you only want to use for internet sharing. Also you might have various strategies depending on the status of ...
Hugues's user avatar
  • 401

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