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Reference Charts
Reference charts provide quick comparisons, but a chart should never override the current product, machine, software, or material specification.
Core PNG reference
| Question | Quick reference |
|---|---|
| What type of file is PNG? | Losslessly compressed raster image |
| Can PNG contain transparency? | Yes, through alpha or transparency information depending on color type |
| Can PNG contain CMYK image data? | No standard PNG color type stores CMYK image samples |
| Does changing PPI add detail? | No; actual pixel dimensions determine available image information |
| Can PNG contain editable vector paths? | No |
| Can PNG contain machine instructions? | No |
| Can PNG be used for print production? | Yes, when the selected raster workflow accepts it |
Quick calculation reference
| Find | Calculation |
|---|---|
| Required pixels | Physical size in inches × required pixels per inch |
| Effective pixels per inch | Pixel dimension ÷ physical size in inches |
| Aspect ratio | Pixel width ÷ pixel height |
| Physical inches | Pixel dimension ÷ effective pixels per inch |
Gudiee's DPI and resolution, image-size, aspect-ratio, bleed, and production-compatibility calculators can perform common preparation checks.