GUIDE深度 · Deep dive
Quality, Transparency and EXIF
JPEG quality 80-90% is usually enough for the web; below 70% text edges blur. Transparent images converted to JPEG need a matte (usually white), or transparent areas turn black. Canvas conversion drops EXIF (shooting data/orientation) and color profiles, so keep originals for important photos.
80-90% for web.
Use lossless PNG/WebP for text screenshots.
JPEG has no alpha; set a matte first.
EXIF/color profiles are lost; keep the original.
FAQ
Why did transparency turn black?
JPEG has no alpha and defaults to black without a matte.
Can shooting data be kept?
Canvas conversion does not keep it; use a dedicated tool.