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 Home » OlderGeeks.com Freeware Downloads » Photography, Graphics and Images » JPEGsnoop v1.8.0   
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JPEGsnoop v1.8.0

JPEG decoder and detailed analysis .


Description

JPEGsnoop is a detailed JPEG image decoder and analysis tool. It reports all image metadata and can even help identify if an image has been edited.

Introduction

Every digital photo contains a wealth of hidden information -- JPEGsnoop was written to expose these details to those who are curious.

Not only can one determine the various settings that were used in the digital camera in taking the photo (EXIF metadata, IPTC), but one can also extract information that indicates the quality and nature of the JPEG image compression used by the camera in saving the file. Each digical cameras specifies a compression quality levels, many of them wildly different, leading to the fact that some cameras produce far better JPEG images than others.

One of the latest features in JPEGsnoop is an internal database that compares an image against a large number of compression signatures. JPEGsnoop reports what digital camera or software was likely used to generate the image. This is extremely useful in determining whether or not a photo has been edited / tampered in any way. If the compression signature matches Photoshop, then you can be pretty sure that the photo is no longer an original! This type of analysis is sometimes referred to as Digital Image Ballistics / Forensics.

JPEGsnoop reports a huge amount of information, including: quantization table matrix (chrominance and luminance), chroma subsampling, estimates JPEG Quality setting, JPEG resolution settings, Huffman tables, EXIF metadata, Makernotes, RGB histograms, etc. Most of the JPEG JFIF markers are reported. In addition, you can enable a full huffman VLC decode, which will help those who are learning about JPEG compression and those who are writing a JPEG decoder.

JPEGsnoop can now also parse and decode Photoshop files!

Other potential uses: determine quality setting used in Photoshop Save As or Save for Web settings, increasing your scanner quality, locating recoverable images / videos, decoding AVI files, examining .THM files, JPEG EXIF thumbnails, extract embedded images in Adobe PDF documents, etc.

Version History
Major code cleanup and moved source to GitHub

Fixed vulnerability (div0) with invalid DQT (thanks to Naf)
Fixed vulnerability (DLL hijacking)
Fixed compression stats for files with RST markers
Fixes for batch file processing
Fixed Photoshop 8BIM, XMP decode reporting
Fixed command-line histogram output mode (-histo_y)
Fixed command-line help for 'dhtexp'
Fixed batch processing output with foreign characters
Fixed batch processing with image decode option
Fixed signature upload functionality
Major code cleanup to eliminate warnings (Visual Studio 2017)










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Downloads Views Developer Last Update Version Size Type Rank
1,974 5,712 Calvin Hass <img src="https://www.oldergeeks.com/downloads/gallery/thumbs/JPEGsnoop_th.png"border="0"> Jan 10, 2020 - 12:47 1.8.0 1.43MB ZIP 5/5, out of 11 Votes.
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JPEGsnoop  v1.8.0  
      
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