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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12 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
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0answers
37 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. ...
67
votes
6answers
12k 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 ...
7
votes
2answers
534 views

can we change jpeg image size with out decoding and re-encoding

I want to convert 640x480 jpeg image to 320x240 jpeg image. 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 ...
0
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2answers
54 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 ...
0
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1answer
38 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?
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0answers
20 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
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1answer
160 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?
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0answers
10 views

How can I insert thumbnail to an existing thumbnail

I have an existing jpg, how can I add an embedded thumbnail to the jpg exif data? And after that, how can I view the thumbnail of the jpg to make sure that is insert correctly?
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1answer
68 views

How can I convert a large PDF to PNG?

I want to convert a very large PDF file (>2GB) to a PNG (or JPEG) file so that it is easier to open and look at. I want to do that without opening the PDF file since it is too large to be opened. Is ...
0
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0answers
327 views

How to convert PSD to JPG or PNG on Linux with Gimp CLI/batch mode (or other server-side tool)?

I've been working on a theoretically simple web service to convert PSD or AI files to jpeg, png or some web-compatible format. I was able to successfully use ImageMagic's convert -flatten sample.ai ...
0
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0answers
41 views

jpg repeating gif imagemagick

so this is my first post on Stack Overflow after years of being a read-only guy. This time i have hit a wall and can't really get past it and would really appreciate your positive response. This is ...
0
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2answers
109 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?
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votes
0answers
16 views

Copy all meta tag from SRC jpg to DST jpg except thumbnail

I just started to use the EXIFTool but can't find out the way to copy all meta info from a file to another file with out destroying the destination file's thumbnail image. Is there any way to do so ?
1
vote
1answer
232 views

Imagemagick killing colour quality when resizing image

I'm trying to resize a bunch (450+) of images through imagemagick, they all start at 500x500 and I've written a script to resize them to about 5 different sizes. Now I've converted them I notice that ...
0
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0answers
83 views

ffmpeg: converting jpeg image sequence to movie gets error “not enough frames to estimate rate consider increasing probesize” [closed]

I have an image sequence with a numbering system of: image-00001.jpg. I want to convert this to a movie using ffmpeg. I always get the error in the title no matter what I do. Below is the syntax I'm ...
1
vote
0answers
116 views

Image optimization: Photoshop CS6 vs jpegtran / OptiPNG

Is there any difference in terms of algorithm for optimization between Photoshop's Shift+Alt+S (save for web) and jpegtran's -optimize and -progressive? It seems my images are not reduced (or reduced ...
0
votes
0answers
76 views

Selectively deleting files with same filename (raw, JPG)

I am a photographer and generate "raw" and JPG images. At a certain point in my workflow, I need to delete all the JPG images before proceeding. That's easy enough; in Windows Explorer, one can sort ...
3
votes
3answers
555 views

How to automatically rotate images based on EXIF data?

I know how to do it manually. Now I would like to automate that based on EXIF data. I already have exiftool installed, but looks like it can only read the data, but can not rotate the image. There is ...
1
vote
1answer
327 views

Apply jpegtran.exe to directory

I am trying to optimize a directory of images with jpegtran.exe but I can't figure out how to make it work. Does anyone have experience with this? I found this article about scripting jpegtran but ...
1
vote
1answer
416 views

How to remove string from JPEG files using find?

I have many files in many media catalogs with some string and I want to remove this string. The string is contained inside JPEG files and looks like: ...
0
votes
0answers
129 views

Change ALL times in metadata with exiftool

I have a lot of photos, taken during our last holiday, but I forgot to set the right timezone. I had a look to exiftool, and I could change the EXIF standard date times with this command exiftool ...
0
votes
2answers
196 views

Watermark does not show in Windows Explorer

I have noticed that on certain photos with watermarks, the watermark will show in programs like Windows Photo Viewer and Paint but not in Windows Explorer. Here is an example photo and related ...
0
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1answer
256 views

Why does my image look sideways in thumbnail view but correct when I open it?

This is important because I will be submitting it for my visa application (rotated images disqualify you). The image looks rotated sideways in thumbnail view on my computer, but when I double-click ...
0
votes
1answer
333 views

creating an alpha channel for a jpeg image in paint.net

i'm using paint.net until I can afford photoshop elements. I notice that you can change the opacity slider in the layers menu opening 'properties', then it shows an image with the transparency ...
0
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0answers
96 views

Excel - How do I write a formula or a macro to copy cells to a JPG file properties?

I have over 1000 jpg files and one excel file with all the properties(metadata) for them - title, subject and tags. The excel looks like this: Number ......Title ....... ...... Subject .. ...
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1answer
817 views

The JPG file on my Open Office document is blurry when exported to PDF

I have tried both Open Office and Word, and the issue is the same. All looks fine until the document is exported to PDF, then the JPG image on the document becomes blurry. I hope someone can help.
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votes
1answer
171 views

Software (for windows) to enhance scanned documents? [closed]

Is there any software for windows that can enhance scanned handwritten (black&white) documents (jpegs) for better readability. I am looking for a software that can do this automatically to a bulk ...
0
votes
1answer
400 views

Extracting jpeg images from mjpeg stream on terminal

I'm trying to extract jpeg images from an mjpeg stream. I've done a search and found a few sources, but those were extracting jpeg images from a mjpeg file, such as this one here. In my case, I don't ...
2
votes
2answers
94 views

Is there a programmatic Linux/Unix/Mac way to obtain the dimensions of a JPEG?

Inner Sanctum ~/mirror/images $ file wardrobe_square_90.gif wardrobe_square_90.gif: GIF image data, version 89a, 90 x 90 Inner Sanctum ~/mirror/images $ file wardrobe_square_90.jpg ...
12
votes
2answers
3k 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 ...
0
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0answers
60 views

iPhoto library too big - recompression of images possible?

my iPhoto has become way too big over time. I'm looking for a way to recompress it, say bringing down the size of the average image from 3 Mb to 1 Mb (just simple JPEG recompress) without losing ...
0
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1answer
358 views

What is “AppleMark”?

I have 2 JPEG files that appear the same, i.e. the same pixel data, same dimensions, but one of them is a much larger file size. The download time for these files is important to my client, so I need ...
3
votes
2answers
554 views

How to save duplicate images in Excel to different JPEGs

I have an Excel sheet with images which are stored as objects in one column and product names in another. I was trying to extract all the images to JPEG files. I was able to achieve this by saving the ...
4
votes
1answer
822 views

Repair broken jpg files

Hi I'm sure there were a lot of similar questions asked, but after searching a lot I didn't find any post describing my situation. I have some jpg files which have some colours wrong after a certain ...
0
votes
2answers
659 views

Convert JPG to Video for playback in VLC

Is this a quick/simple way to convert a bunch of JPG stills into some sort of video file so it can be played back in VLC? If the convertion can be done using VLC, that would be preferred.
4
votes
4answers
39k 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
0answers
69 views

Using jpegtran with ffmpeg via piping?

I use ffmpeg to generate a ton of jpeg images. However, these jpegs aren't optimized by ffmpeg. On average, the images losslessly compress another 10-20% when I run them through jpegtran. I don't ...
0
votes
2answers
1k views

Convert PDF to JPG without Imagemagick

Is there a way to convert a common UTF-8 encoded PDF to a JPG without using ImageMagick or Ghostscript? The reason I'm asking is, that I have to replace or "simply" double layer a small part (date) ...
0
votes
2answers
797 views

H264 decompression/decomposition into JPG - quality issues

I'm trying to decode a 1920x1080 30fps h264 stream. Individual frames look outstanding in VLC media player (pausing the playback), but when I decode using avconv (ffmpeg has been deprecated and ...
2
votes
3answers
2k 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 ...
0
votes
1answer
181 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? ...
1
vote
1answer
673 views

How to merge an image into an audio file?

I am trying to merge a thumbnail-size (104x80) image into an audio file (M4A). I want it to be played in JW Player, but it doesn't seem to support thumbnails. I have tried it in VLC Player, but the ...
0
votes
0answers
25 views

Browser downloads jpgs, doesn't display them

My browsers (Chrome, IE both exhibit this behavior), when faced with an href link that points to a .jpg file, downloads it rather than displays it. I think perhaps something happened with file ...
1
vote
1answer
422 views

Any Open Source pdf to jpg or png converter? [duplicate]

I need open source engine that converts pdf files into jpeg or png files which I will feed in to ocr engine. Currently I am using PDFBox for this task, but while it does the job, it reports weird ...
4
votes
3answers
4k 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 ...
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votes
2answers
843 views

PNG file size is too big after converting from JPG

I try to convert a JPG file to PNG, but the size is still too big, about 7 MB. What's wrong? I used Microsoft Paint to convert it. The original file is only 500 KB in JPEG, yet the PNG file is 7 MB. ...
0
votes
1answer
145 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")
1
vote
3answers
3k 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 ...
0
votes
1answer
16k views

How to convert a 24 bit JPEG image into 8 bit image?

I have a 24-bit image. I need to convert it into an 8 bit JPEG image. Can it be done by MS Paint or MS picture manager or I need to download any tool. I tried some tool but that did not work. Will ...