34
votes
Accepted
Why does Google Chrome save a JPG image to WEBP instead?
File extensions are quite irrelevant for HTTP: if the server says Content-Type: image/webp, then it's a WebP image, period. (Compare to how most websites don't use .html in their URLs anymore even ...
- 516k
22
votes
Accepted
What's the difference between jpg and JPG on mac?
At a guess, one came directly from a camera, the others were saved by an application in the Mac itself.
There is no difference whatsoever in the file type itself, merely that one is a hangover from ...
- 51.4k
20
votes
Is it possible to change orientation of JPG image without rotating it (and thus losing information)?
JPG can be rotated using only EXIF data, so no re-encoding is necessary.
I found this tutorial on the orientation flag - JPEG Rotation and EXIF Orientation
These days, most image apps can handle this ...
- 51.4k
18
votes
Why does Google Chrome save a JPG image to WEBP instead?
CDN data traffic reduction
WebP is an image format currently developed by Google, based on technology acquired with the purchase of On2 Technologies.
If the User-Agent field in your HTTP(S) request ...
- 2,341
13
votes
Accepted
Is it safe to simply rename a .jfif file to .jpg?
Yes.
JPEG is not a file format - it's a compression method. It doesn't specify how the compressed data should be stored in a file. There are two file formats that fill in this gap: the original JFIF, ...
- 58.7k
10
votes
What's the difference between jpg and JPG on mac?
This is just how the files were created.
Someone, or some piece of software, chose to use .JPG in some cases and .jpg in others.
That's it. It doesn't mean anything.
- 3,076
8
votes
How to disable WebP images in Chrome?
Open-source solutions
WebP is an image format currently developed by Google, based on technology acquired with the purchase of On2 Technologies.
If the User-Agent field in your HTTP(S) request header ...
- 2,341
8
votes
How to disable WebP images in Chrome?
Method 1 provided by @Darius half works, but needs to be combined with a second modification. Changing the User-Agent alone does not fully solve the problem as the image server may also look at the ...
- 181
7
votes
How can I tell if a JPEG was saved as Progressive?
If you're on a unix, use the file command:
$ file image.jpg
image.jpg: JPEG image data, Exif standard: [TIFF image data, little-endian, direntries=0], progressive, precision 8, 2000x1200, components 3
- 71
7
votes
How to disable WebP images in Chrome?
I found a possible solution to this. I simply added a question mark (?) to the end of the url and was able to download the image. So for example:
https://www.fritolay.com/sites/fritolay.com/files/2019-...
7
votes
Accepted
Find jpg files without Keywords/Subject in Iptc/Xmp and copy them
This can be done with a single exiftool command. Exiftool has powerful batch ability built in and there is almost never a need to create a script.
The one caveat is that you must first CD into the ...
- 1,880
6
votes
Accepted
Create video from bunch of JPEGs
If you rename the images to be consecutively numbered, then you can use
ffmpeg -y -framerate 1 -i <path>\%06d.jpg -r 5 -c:v libx264 -pix_fmt yuv420p <path>/video.mp4
Consecutively ...
- 39.7k
6
votes
Accepted
CIFS mounted on Linux from Windows shows corrupt/distorted images
There is a known bug with the version of Apache2 (2.4.25 Debian) I am using that serves the CIFS files in a funny manner causing the file corruption. For those using Apache2 you will likely be dealing ...
- 101
6
votes
Why does Google Chrome save a JPG image to WEBP instead?
Not sure how long this will work, but it works as of today (08/07/2021).
As @user1686 mentioned above, If the image ext. is jpg or png in the URL, but it tries to save as a Webp image then it is ...
5
votes
Reading animated JPEG ("MVIMG_") in Windows 10
So apparently this is a custom file format consisting of a JPEG image and a MP4 video.
I found this GitHub repository containing a Bash script to extract the video part of the file.
Because the (...
- 66.2k
5
votes
How to use dcmcjpeg to convert DICOM to JPEG?
Please use the tool dcmj2pnm:
This tool converts DICOM images to PGM/PPM, PNG, TIFF, JPEG or BMP
Here is a usage sample:
dcmj2pnm --write-jpeg --min-max-window ST1-SE1.dcm foot-xray.jpg
Use the ...
- 103
5
votes
Is converting images to pdf lossy?
PDF is a container format, not an image format. Thus it should be possible to embed an image into a PDF, and then subsequently extract it, without recompression. However, ImageMagick convert does ...
- 2,117
4
votes
How to generate an EXIF thumbnail for a JPEG?
The task can be completed with exiftool (for updating EXIF) and ImageMagick (for crating thumbnails).
First let's download and install/extract both programs. Put exiftool to any folder and include it ...
- 288
4
votes
Meaningful thumbnails for a Video using FFmpeg
This is a really hard task to do. The very first thing to do is define "meaningful" in your context: are you looking for the most uniform image? an image that describe your video but does ...
- 141
4
votes
Removing Background color in Paint.net
This Paint.NET plugin is created specifically for the problem: Deviation to alpha. I wrote it after struggling with this myself and finding the otherwise excellent plugins in thdoan's answer lacking ...
- 221
4
votes
How to convert multiple images at once from JPEG to PNG?
What you are looking for is an image conversion software that supports batch conversion, aka batch processing.
Some conversion software has batch conversion built in. Alternatively, you can write a ...
- 23.7k
4
votes
How to convert multiple images at once from JPEG to PNG?
You can batch convert images on Mac with Finder:
Open Finder and select the images you want to convert.
Open them in Preview and then Select All.
Go to "File" and choose "Export Selected Images".
...
- 529
4
votes
Accepted
Can I change the compression ratio of a JPEG image on travel.state.gov (passport photo tool)?
the tldr: in Chrome you open up the developer console (Ctrl + Shift + J) and run,
MAX_COMPRESSION_RATIO = Infinity
We can devise two ways to do this (1) by editing the image, or (2) by editing the ...
- 9,678
3
votes
How to repair broken JPEG files?
I wrote a short Python program that can automatically do the shift and color-correction, or at least make a best-effort attempt:
$ ./FixJpeg.py mNQdX.jpg
Opening mNQdX.jpg.
Found color corruption ...
- 170
3
votes
Print jpg's with file names
Fastone image viewer is free and does fantastic job at printing any image file with file name. Try it and be happy.In Fastone image viewer select single or multiple file , then go to print , in print ...
- 31
3
votes
How to use dcmcjpeg to convert DICOM to JPEG?
Just a little more info for those trying to run this in Linux:
Install
sudo apt-get install dcmtk
DICOM Information
dcmj2pnm --image-info --no-output --verbose image.dcm
Extract all images
dcmj2pnm -...
- 131
3
votes
Accepted
ImageMagick failing to match images lower than given dimensions
The find command derives from this answer. Now I see there is a bug there, you replicated it.
This is the bug: the fragment (( size[1] < 200 && size[2] < 200 )) should be (( size[0] <...
- 83.4k
Only top scored, non community-wiki answers of a minimum length are eligible