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 ...

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13
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4answers
14k views

How to batch combine JPEG's from folders into PDF's

I have a about 500 folders with images inside. Is there a way I could batch convert this so that I get .pdf files that contain all images inside as pages? EDIT: There should be 500 PDF's created, ...
0
votes
1answer
37 views

guess the secret text inside a jpg file using outguess in linux

How can I get the secret content of a jpg file using outguess command without knowing the passphrase ? Before all is it possible to do so, guessing the content using outguess in linux without knowing ...
1
vote
2answers
5k views

How to convert JPEG JFIF files to JPEG Exif format?

I recently put the SD card of my camera in a Windows 7 PC and start browsing pictures on it. I noticed some were not aligned correctly and use rotate feature included in Windows Photo Viewer in order ...
7
votes
12answers
13k views

Stop Windows 8 from converting wallpapers to low quality JPGs

This has been bugging me on Windows 7 as well, and much to my chagrin Microsoft didn't bother addressing that issue in Windows 8. Take this image for example: (Click to open original unaltered ...
1
vote
1answer
8k views

What is the difference between jpeg Progressive and Optimized in photostop?

When saving a image for web and devices as JPEG, I can either choose progressive or optimized (or none). What is the difference between both and what should I use ? In my case, the image is the ...
5
votes
4answers
7k views

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 ...
0
votes
1answer
61 views

PHPFarm with jpeg integration

So I'm attempting to get phpfarm up and running, but for some reason can't get jpeg support from gd to work... Here are my config options configoptions="\ --enable-bcmath \ --enable-calendar \ ...
61
votes
7answers
70k views

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.
0
votes
0answers
33 views

trying to open damaged jpeg images

I have jpeg images that have been recovered on my computer but I cannot open them. I presume they are damaged. I have tried using Jpegsnoop and also Format factory 3.34 but cannot open them. I tried ...
28
votes
8answers
37k views

JPEG vs PNG vs BMP vs GIF

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.
0
votes
0answers
33 views

Broken pdfs after extracting from ods file

I have several xls files with lots of embedded pdfs in them and I need to automatically extract them. I have an almost working solution for this. First I convert these xls to ods using LibreOffice, ...
7
votes
4answers
225k views

how to change the dpi of an image

I have an jpeg file of 300 dpi. I need to reduce it to 200dpi. How can I do that? Do I need any specific application or it can be done using Picasa/paint/MS picture manager, if yes how? Thanks
0
votes
1answer
65 views

Use ffmpeg for JPEG to TIFF conversion

I would like to use Tesseract OCR with a video. With ffmpeg I can export some (.jpeg) images from a video. Can I convert a .jpeg into a valid .tiff or export directly .tiff images from the video with ...
1
vote
2answers
118 views

JPEG images are pixelated on browsers (websites)

Almost all jpg images on web pages are pixelated. I've tried other browsers and it's the same. Only JPEG images that get pixelated. PNGs display well. This comparison image preview is a screenshot ...
4
votes
3answers
31k views

How to split a mp4 video into jpg pictures? [duplicate]

I have a video(with 4 min) in mp4 format(probably MPEG-4) that I need to convert into a lot of pictures(jpg's). I would need to take a lot of Print Screen and paste on MS Paint to manually do that, ...
25
votes
3answers
9k views

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 ...
1
vote
7answers
4k views

How to fix an image that doesn't open in Photoshop, even though it opens fine in a browser?

Someone emailed me an image. I see it in Gmail, and I can see it in a browser, but when I try to open it up on Photoshop, I get an error saying: Could not open "XYZ.jpg" because an unknown or ...
8
votes
2answers
561 views

Re-saving JPEG while keeping quality

Sometimes I use XnView's* "batch conversion" tool to downsize a bunch of JPEGs (to maximum of 1600x1200). But some of them are equal or smaller than that and no resizing is done. Is any image quality ...
0
votes
0answers
50 views

FFmpeg - Converting JPG to AVI issue

I'm having an issue converting jpg files to avi using ffmpeg. I use this command: ./ffmpeg -start_number 1 -i ~/PycharmProjects/images/test/img%04d.jpg -vcodec mpeg4 test.avi My files are named ...
0
votes
2answers
1k views

convert serveral image files to a single djvu file

Suppose I have serveral BMP image file, say 001.bmp, 002.bmp,..., 100.bmp. I want to convert these files to a single djvu file, whose first page is the content of 001.bmp, the second page is the ...
0
votes
1answer
168 views

Default file extension for picture downloads on Chrome?

My google chrome will only save pictures as KanKan (then there's some Chinese: 图秀 or something) How do I get it back to .jpeg as a default? (the drop-down menu only says "all files")
0
votes
2answers
276 views

JPEGs of the same resolution have different sizes

I have a collection of photos taken from my digital camera. All of them were taken with the same settings (same resolution etc...). However all these pictures have different file sizes. Why is this? ...
13
votes
2answers
5k views

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 ...
3
votes
2answers
931 views

Gimp reports huge file size (in the GB range) when trying to export to JPG

If I load a JPG file (2-4 MB in size) into Gimp for photo manipulation and try to export it, Gimp reports the file size will be in the region of 1.3 GB! I have to export it as PNG, which results in a ...
0
votes
10answers
4k views

Reducing image size on Windows XP

I have a scanned JPG file and due to high quality scanning, the file size is large. What I would like to do is reduce the image size of the file, keeping the jpg format, but losing Quality obviously. ...
0
votes
1answer
64 views

Why there are JPEG files with weird file names in folders with videos

Windows 8.1: 64-bit. Since couple of days I see that that in every folder containing a video[s], found a JPEG file with a weird name followed by a file name of a video in the folder. + Is that ...
13
votes
5answers
11k views

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.
0
votes
2answers
83 views

Jpeg size difference

I have a 2560x1600 JPEG image and its file size is 2,532KB. Due to a website's upload restriction, I had to reduce the size of the image. Naturally I thought, "I'll just resize it in Windows so I can ...
3
votes
2answers
979 views

OS X says “the standard extension is” .jpeg, but according to whom?

When I attempt to save a file as "picture.jpg", OS X unhelpfully informs me that the standard extension is ".jpeg". I think the bazillion .jpg files on the web beg to differ, so where does Apple get ...
2
votes
2answers
10k views

Print jpg's with file names

I have MS Office 2010, Windows Paint. Prefer to print multiple photos on a page with their filenames. Any suggestions? I am using office computer so I cannot install any software.
1
vote
1answer
562 views

How to find/detect hidden files inside JPEG file?

I'm trying to find out what is a good way to detect whether an image file has other files hidden inside it? related link: Hide files inside of JPEG images at lifehacker
0
votes
1answer
4k views

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?
0
votes
1answer
141 views

Microsoft Visual C++ Runtime error when viewing JPEG files in Explorer

I am getting the following error each time I view JPG files in the windows explorer in Detailed view. It also appears when you open the properties of the file. I'm using Windows 8. Microsoft Visual ...
3
votes
4answers
3k views

Is there a way to find only progressive jpegs on Mac using Adobe CS or other apps?

To put my work up on my website, I initially collected some images and converted them to progressive jpegs. But later I went in and added more. I now can't tell simply by file size which ones are ...
1
vote
1answer
326 views

Convert large JPG to zoomable SWF

I have a largeish JPG (2400x1000) of an organogram. It would be good to be able to convert this JPG into an SWF that could be zoomed with the mousewheel when displayed within a webpage. Is this ...
1
vote
2answers
238 views

Append Script to an Image

I have a JPG image. I want to add/append a small piece of script(It can be of any language like PHP,Javascript,etc), but the image extension should not be changed. It must be jpg itself even after ...
0
votes
1answer
563 views

Incomplete jpg or image files?

One of my tools didn't work properly and i have a lot of image files that isn't complete (50%, 70, it varies). What is a command line tool or lib (C++ or .NET, .NET preferred if not command line) to ...
1
vote
1answer
1k views

7-Zip: Unsupported Compression Method while trying to extract a zipx file that consists of JPEGs

A zipx file I received consists of .csv files and .jpeg files. I used 7-zip to extract them. While the .csv files were sucessfully extracted, the JPEG files didn't. The error was something like this ...
9
votes
2answers
626 views

Can we change size of an JPEG image with out decoding and re-encoding it?

I want to convert a 640x480 JPEG image to 320x240. I know it can be done by decoding the JPEG image into raw YCbCr, scale it and re-encode it into JPEG. But is it possible possible with JPEG encoding ...
1
vote
0answers
17 views

Software to link up photos in a line to form one image

I have several (around 50) photos of multiple sections along a river, each with a metre stick in the photo for scale. I need a way to link these photos up in a single image, whilst being able to crop ...
0
votes
2answers
351 views

Load file automatically on start up windows xp

I have a few text files that I want to see every time I turn on the computer, like Post-It notes. So basically as the title says, how can I configure Windows XP to load specific files on startup?
69
votes
6answers
18k views

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 ...
1
vote
0answers
102 views

How does jpegoptim compares to mozjpeg 2.0

jpegoptim is a lossless optimization compressor. I've used it for several years with huge sucess. mozjpeg 2.0 has just been released and they claim a 5% improvement over the standard libjpeg-turbo. ...
0
votes
2answers
222 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
149 views

Why does ImageMagick's montage limit the JPG output to 65500 instead of 65535?

JPEG/JFIF supports a maximum image size of 65535×65535 pixels. Is there any reason why ImageMagick's montage limit the JPG output to 65500 instead of 65535?
0
votes
0answers
52 views

How to scan documents into Windows 8.1 as JPEG images?

I recently updated my computer from Windows 7 to Windows 8.1 and downloaded an up-to-date interface for my Brothers MFC-J825DW printer to accommodate scanning documents. Unfortunately, now when I ...
1
vote
4answers
5k views

Saved Visio drawing (VSD) as JPG, how to covert it back to a Visio file?

I have made a class diagram and i have saved it as a JPG from Microsoft Visio. How do I convert the JPG to a VSD file so that I can make changes to it?
0
votes
2answers
264 views

Image to PDF quality

I am converting multiple jpg images to a single PDF using following command convert *.jpg mybook.pdf but the pdf quality is not good. Is there a way to retain the original quality of images in ...
6
votes
3answers
5k views

How to convert GIF files to PNG or JPEG in OS X with command line?

I have 10k+ GIF files that I need to convert to PNG or JPEG preferably using command line so that I can automate it. I'm not worried about losing quality or transparency, just need to prepare files ...
2
votes
1answer
615 views

JPG image not opening?

This image didn't open in photoshop, paint, MS office or windows photo viewer but it simply opens in chrome. What's wrong with this image?