FIELD NOTES

Practical tool guides

Step-by-step help for image processing, JSON, unit conversions, and Unix time.

Separate image pixels from printer dots, calculate useful print density, and understand what a 300 PPI setting can and cannot change.

See why a photo can lose its edges or gain borders, with a worked 4:3-to-5:4 example and a checklist for the final print dialog.

Calculate pixel dimensions for 4 × 6, 5 × 7, 8 × 10, and A4 prints, while allowing for orientation, cropping, and the printer’s requirements.

Fit landscape and portrait images inside a pixel boundary while preserving their proportions.

Place independent text layers, rotate or repeat them, and inspect placement across a mixed image batch.

Separate pixel dimensions, encoding format, quality settings, and transparency when comparing image file sizes.

Find invalid quotes, trailing commas, comments, and large-number precision risks before formatting JSON.

Convert timestamps without mixing units or guessing whether a date is UTC or local time.

Distinguish decimal and binary data units, and avoid confusing bytes with bits.

Create named QR batches, choose PNG or SVG, and print A4 or Letter labels without losing the quiet zone.

Check the discount and tax calculation order, turn a quote into an invoice, and keep an editable JSON backup alongside the PDF.