JPEG is a lossy-compression method for a digital image. The images can end up in many JPEG image containers (JPEG, JPG, JIF, JPE, JFI, JFIF) depending on the parameters surrounding the compression of the image data. JPEG is actually an acronym for Joint Photographic Experts Group, the group that created the compression standard for JPEG.
Questions tagged [jpeg]
368 questions
251
votes
13 answers
Batch converting PNG to JPG in linux
Does anyone know a good way to batch-convert a bunch of PNGs into JPGs in linux? (I'm using Ubuntu).
A png2jpg binary that I could just drop into a shell script would be ideal.
nedned
- 3,342
117
votes
9 answers
Meaningful thumbnails for a Video using FFmpeg
FFmpeg can capture images from videos that can be used as thumbnails to represent the video. Most common ways of doing that are captured in the FFmpeg Wiki.
But, I don't want to pick random frames at some intervals. I found some options using…
d33pika
- 1,981
87
votes
6 answers
Opened a JPG picture with notepad, pasted all the "text" to a new notepad file, changed to .JPG and it no longer opens. Why?
This phenomenon has been leaving me questions to ask.
Here is the detailed experiment, my OS is Windows 7 x64 SP1:
I changed a picture (JPG) file to TXT by simply changing its extension (or one could just choose to open the JPG with notepad, same…
Nguyễn Tuấn Danh
- 1,075
54
votes
5 answers
Removing Background color in Paint.net
I have a .jpg image of a text logo, it looks similar to the example image here:
I am using paint.net.
Now, I would like to change the image to .png, then I would like to remove all the white background, and make the image black text on a…
Greeso
- 641
49
votes
6 answers
Convert a bunch of BMP files to JPEG on Linux
Someone sent me a bunch of BMP files and I need them in JPEG. I could convert them one by one using GIMP, but I'd rather do it all in one go. I have Ubuntu.
JoelFan
- 4,022
43
votes
8 answers
JPEG vs PNG vs BMP vs GIF vs SVG
I would like to know which one of these formats requires less memory for the same quality of the picture, and what are the main differences between these formats.
Narek
- 1,461
42
votes
1 answer
Search for a JPG on my computer by using a smaller JPG?
I have a low resolution image that I know I have the full resolution image stored somewhere on my computer. Is there anyway to search for a JPG on my computer by using a small resolution of an image as an input to search for?
AAA
- 577
41
votes
9 answers
Why does Google Chrome save a JPG image to WEBP instead?
I'm trying to save what appears to be a JPG image from Chrome and always end up downloading a WEBP image instead.
I'm on Chrome Version 80.0.3987.163 on macOS Catalina (10.15.4) and I'm trying to download a JPG image from a website. Even though the…
frabonomi
- 537
32
votes
4 answers
How to convert a photo to a black and white image by ImageMagick?
How can I convert a JPEG photo to black and white (not grayscale) image like output of a FAX scanner, by ImageMagick?
ohho
- 3,124
32
votes
6 answers
How to disable WebP images in Chrome?
Google Chrome sometimes takes a .jpg image and converts it to a .webp file.
The problem is that when I save this image to file, I cannot open the file. I have tried manually changing the extension of the file to ".jpg", but the file is still…
rubik's sphere
- 641
25
votes
2 answers
What is the largest size of a 640x480 JPEG?
I'm creating a data storage device that takes a certain number of pictures of the night sky over a couple of hours, and the pictures will be downloaded right after they are all taken. The memory card must be able to store all of the pictures at…
Blue Ice
- 557
24
votes
3 answers
How can I modify the EXIF orientation tag of an image?
I want to change the EXIF orientation tag in my JPEG images but without actual rotating of them. I want to do this to use them as a test case for an application I made.
How I can do that in Linux? Can I do it with exiftool? And if so, how?
Wazery
- 842
21
votes
8 answers
How to find the JPG quality?
When I save a JPG file with GIMP, I can adjust the quality I save it at, from 0-100 (I use 89). It seems like I've used an app to see what this number was on saved file but if I did I can't for the life of me figure out what it was. Any suggestions…
Nathaniel
- 4,386
19
votes
8 answers
How do I batch convert thousands of NEFs to JPEGs?
I accidentally set my camera (a Nikon D70) to shoot in NEF only and not NEF+JPEG.
Obviously, this will be a major pain when I want to go through them all. I don't envy having to wait for seconds at a time for a single picture to render.
Is there any…
nc4pk
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- 14
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19
votes
7 answers
Editing JPEG EXIF properties
How can I edit EXIF properties of JPEG files on a Windows machine?
Some image editing utilities handle the Rotation property wrong, which leaves me needing to make manual edits after rotating images in those utilities. A utility which can perform…
Suma
- 1,484