Tag
8 posts
experiment
Everything filed under experiment.
Does Cropping Shrink a Photo?
A 16px trim grew 7 of 7 JPEGs at q95 (median 1.5036x). Cropping is a re-encode; the scissors do not set the bytes.
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Why does this JSON validate in one tool and fail in another?
A UTF-8 BOM turns a 34-byte valid object into 37 bytes. jq passes; browser JSON.parse fails at U+FEFF. A valid stamp is a parser’s stamp.
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Is a photo of your signature a signature file?
No. A page photo is a grey rectangle on the line. A stand-in page was 898,344 bytes; transparent ink PNG was 65,709. The win is missing paper.
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Does converting a JPG to WebP shrink the file?
On 7 photos, lossy WebP q80 was a median 44.3% of the JPG. Lossless WebP was 414.6%. One toggle, opposite outcomes.
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Does removing EXIF shrink a photo?
A real iPhone photo had 9,975 bytes of EXIF including GPS. A lossless strip saved exactly that. A canvas re-save at quality 95 grew 24%.
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If you draw a black box on a PDF, is the text gone?
No. A black rectangle sits on top of the text. pdftotext still returns Account 4417-2291. Covering is not removing.
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If I resize a photo to 50%, is the file half the size?
50% of each side is 25% of the pixels. 17 photos landed at a median 25.4% of original bytes, not 50%.
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I compressed 20 real files at JPEG quality 80. Here's what actually shrank.
20 real files, JPEG quality 80, bytes measured from disk. Median save 15.5%. One small web JPEG got bigger. PNG screenshots were the outliers.
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