The DiffALL Blog
Practical guides on image and video quality metrics, compression, and media comparison workflows.
Your 320kbps MP3 Might Be a 128kbps MP3
A bitrate says how a file was last saved, not what is inside it. Why re-encoding can't add detail back, and the one measurement that shows the truth.
Video ComparisonIs Your Video's Bitrate Too Low? How to Tell Without Guessing
Bitrate means nothing without resolution and frame rate. The one number that works for any video, the recommended upload rates, and a free bitrate checker.
Image ComparisonWhy a Single Image Quality Score Out of 100 Lies to You
Quality checkers give you one number. Why averaging blur, noise, compression and clipping hides the one thing you needed to know, and what to measure instead.
Image ComparisonCompare App Icons and Favicons Across Every Export Size
One source icon becomes a dozen sizes, from 16px favicons to 512px store listings. How to catch what breaks in the smaller exports before you ship.
Audio ComparisonHow to Tell If an Audio Interview Has Been Cut or Edited
Compare a published interview clip with your raw recording to see whether anything was trimmed, reordered or spliced, and exactly where.
Audio ComparisonCompare Dubbed Voiceover Timing to the Original Track
A dub can be a perfect translation and still feel wrong if lines start late or run long. How to check a voiceover's timing against the original track.
QA & TestingCompare Email Templates Across Gmail, Outlook and Apple Mail
The same HTML email renders differently in every client, and 'looks fine in my inbox' is not QA. How to compare renders across clients before you send.
Video QACompare a Live Stream Recording to the Source Feed
The stream looked fine live, but is the archived VOD a clean copy? How to check a recording against the source feed for dropped frames and freezes.
Image ComparisonHow to Compare PowerPoint Slides Between Versions
A deck comes back from review, or a teammate forks your template. How to find exactly which slides, and which elements on them, actually changed.
Text & DataHow to Compare Two Word Documents (DOCX) for Changes
Compare two Word documents that Track Changes can't: a 'final' sent back to you, a forked template, a redline you didn't make. Find every changed word.
Image ComparisonHow to Check If an Image Has Been Reused Without Permission
Spotted what looks like your photo or design on someone else's site? First confirm it really is your file, cropped, resized or recompressed. Here's how.
Audio ComparisonHow to Compare Audio Before and After Loudness Normalisation
Normalising to a LUFS target changes more than volume. Check what a loudness pass did to your audio: the clipping, pumping and lost dynamics a meter misses.