Image Processing Practical Guides
Step-by-step answers to everyday questions: compress to a target KB, pick the right format, match marketplace image sizes, get ID photos right and handle image SEO.
PDF watermarking: copyright marks for internal documents
Adding a watermark before sending contracts, quotes or internal docs reduces careless forwarding. This article covers wording that deters misuse, opacity and tiling, and why the file grows after watermarking.
Format conversionWhat are TIFF and AVIF, and when should you convert to JPG
TIFF is the standard for print and scanning; AVIF is a new high-compression format—both often fail to open in browsers and chat apps. This article covers when to use each and how to avoid quality/color drift when converting to JPG.
Compression TipsHow to shrink an oversized GIF: color count, size and frame dropping
GIFs easily hit ten-odd MB—too big to send and slow to load. This article explains the trade-offs of palette colors, dimensions and frame dropping, with a preset that takes 10MB down to 2MB.
Format conversionVideo to GIF: how to set frame rate, size and file weight
The most common video-to-GIF failure is a tens-of-MB file you can't send. This article uses concrete numbers to show how frame rate, width and duration combine to set GIF size, with different presets for chat emojis vs tutorial clips.
Format conversionSplitting and extracting PDFs: break a long file into single pages
You only need a few pages of a long PDF, or want each scanned page as its own file. This article explains page split vs extract, how to merge back, and scan-splitting caveats.
Format conversionHow to convert JPG to PDF: merging, order, size and print layout
When merging ID cards, contracts, invoices or homework into PDF, the usual problems are wrong order, oversized files and print cropping. This article covers order control, page-size choice and size compression.
Format conversioniPhone HEIC photos won't open or upload? The right way to convert to JPG
iPhones shoot HEIC by default—Windows can't open it, application systems reject it, and WeChat often mangles originals. This article explains what HEIC is, why convert to JPG, and how to keep quality during conversion.
Editing & ProcessingHow to add a watermark that deters theft without ruining the image
A heavy watermark ruins the image; a light one is cropped in one click. This article gives concrete parameters for position, opacity and tiled anti-crop watermarks, plus how to batch-watermark hundreds of images.
Editing & ProcessingWhich ID-photo background color? White, blue, red and where each is used
ID cards, social security, diplomas, résumés and visas each require different background colors. This article maps white, blue and red backgrounds to common documents, with tips on preserving hair edges when changing color.
Editing & ProcessingAI cutout still leaves rough edges? Read this optimization checklist first
Poor AI cutout is usually not the model's fault but low contrast between subject and background and complex edges. This article gives an optimization checklist across shooting, image selection and parameters.
Compression TipsWeChat images: sizes and compression for official accounts, Moments and chats
Official-account cover 900×383, body images 1080px wide, how to split a Moments grid, why chat images look blurry… This article collects WeChat's size and size-limit rules per scenario with compression tips.
Compression TipsHow to compress an image to a target KB: practical methods for three scenarios
Application systems cap files at 100KB, WeChat covers at 2MB, ID photos at 50KB… How do you hit different size limits in one pass? This guide gives a general approach and parameter tips for compressing to a target size.
Format conversionHow to make a favicon: multi-size ICO, PNG and mobile icon specs
Which sizes belong in favicon.ico, why you should also ship an SVG and a 180×180 touch icon, and why the tab icon sometimes shows as a blank block—all explained here.
Format conversionJPG vs PNG vs WebP: a table that explains image format differences
The same image can be 5× smaller as JPG, PNG or WebP. This article explains how each format compresses, transparency support and browser compatibility, with a recommendation on which to pick.
E-commerce imagesTaobao, JD, Pinduoduo main-image sizes and batch resizing
Taobao main image 800×800, JD 800×800, Pinduoduo 750×750, detail width 750px. This article collects each platform's specs and gives steps to batch-resize uniformly.
Editing & ProcessingID photo size chart: 1-inch, 2-inch (with background-color notes)
1-inch 295×413, 2-inch 413×626, small 1-inch 260×378… This article lists common ID photo pixel and mm sizes, with notes on changing background color and hitting a target KB.
Image SEOImage SEO in practice: alt, WebP, compression and lazy loading
Image search brings steady long-tail traffic. From filenames, alt text, dimensions, WebP, lazy loading and structured data, this article gives an actionable image-SEO checklist.