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Convert Pakistan Time Without Guessing DST Offsets
An interview at 14:00 in Karachi and a meeting at 14:00 in London are not scheduled for the same instant. Timezone conversion…
Turn an Image Into Black and White by Luminance
Thresholding is different from grayscale. A grayscale picture has many shades between black and white. A threshold result assigns each visible pixel…
Convert Unix Timestamps With the Correct Unit
A timestamp with three extra digits can describe the same instant in milliseconds rather than seconds. Reading it with the wrong unit…
Apply Pixelation as an Effect, Not Guaranteed Redaction
Pixelation replaces local detail with blocks of averaged colour. It can create a mosaic style or make a background less detailed. Its…
Generate Random UUIDs for New Records
A record identifier should not depend on the next person guessing a sequence. A random UUID offers a convenient identifier format when…
Sharpen Edges Without Claiming New Resolution
A slightly soft image can look crisper when neighbouring pixel differences are emphasised. Sharpening changes that edge contrast. It does not turn…
Calculate HMAC With Matching Keys and Output Formats
A shared secret changes a message authentication code. Two systems must agree on the message bytes, key, algorithm and output representation before…
Blur an Image With a Controlled Number of Passes
Blur softens local detail by mixing nearby pixels. It can reduce visual distraction or create a background effect, but it is not…
Generate a Checksum and Compare the Exact Input
A checksum is useful when you want to know whether two inputs match at the byte level. Even a small edit can…
Increase Contrast Without Crushing the Image
Contrast changes the separation between lighter and darker values. It can make a flat image feel clearer, but too much can remove…
Extract Readable Text From Small HTML Snippets
Copied HTML can include navigation, styling and scripts around the sentence you need. Removing those elements can produce a useful text draft,…
Adjust Image Brightness Without Hiding Lost Detail
A dark picture may need a small brightness correction before it is shared. Raising brightness makes pixel values lighter, but it cannot…