About PJHTech Images

PJHTech Images explains image formats, file size and common image problems.

How the guides are prepared

The guides use format specifications and publisher documentation. Examples are made from original test graphics, and calculations are checked with known inputs. Source links appear on the relevant pages.

AI tools assist with writing and development. Calculations, examples and tool behavior are checked before publication.

What the tools do

You can inspect image headers, calculate aspect ratios and calculate print sizes. The tools do not edit or repair images.