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Why Urdu Nastaliq Is Hard for OCR (With Real Results)
I ran the same Urdu text in Naskh and Nastaliq through browser OCR. Naskh read perfectly, Nastaliq lost about one letter in five. Results, causes and tips.
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What changes when a JPG becomes a PNG
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Your browser decodes the JPG, draws it on a canvas at the same pixel size and saves the canvas as PNG. PNG is lossless, so this step adds no new loss, but it cannot remove loss that already happened. Files up to 10 MB, nothing uploaded.
- Transparency
- A JPG has no transparent areas, so the PNG is fully opaque. Converting does not remove a background; white stays white.
- Quality
- There is no quality setting for PNG output and none is needed. Whatever blockiness or blur the JPG already had is copied exactly into the PNG.
- Animation
- JPG has none, so there is nothing to lose.
- Size in pixels
- Unchanged. A 4000 by 3000 photo gives a 4000 by 3000 PNG, which is part of why the file grows so much. Resize first if the PNG is only for a web page or a document.
- Colors
- Colors are kept as your browser displays them. Photos taken on a phone are drawn upright by modern browsers, so the PNG is upright too.
- Metadata
- Camera data such as the date, device and GPS location is not written to the PNG. That is useful if you share a photo and do not want its location attached.
- File size
- Almost always larger, often several times larger for a camera photo, because PNG stores every pixel without the JPEG compression.
- When to use it
- An upload form or tool accepts only PNG, you plan several rounds of editing and do not want each save to add JPEG loss, or you want to strip camera metadata.
Frequently Asked Questions (FAQs)
Image quality, file size and photo metadata, answered for JPG to PNG.
Will converting to PNG improve my photo?
No. PNG keeps the pixels exactly as they are in the JPG, including any compression artifacts. It only stops new loss from later saves.
Why is the PNG so much bigger?
JPG throws away detail to save space; PNG stores every pixel losslessly. For photos that difference is large.
Is the location data from my phone photo kept?
No. The PNG is written from the canvas, which carries pixels only, so EXIF data such as GPS position is not included.
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