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Re: How to publish a png to 300 dpi in Photoshop
Photoshop Export/Quick Export strips the resolution metadata, as does Export/Save for Web (Legacy). Photoshop Save As will retain resolution metadata. The official PNG specification for the PNG resolution unit is in metres (not inches). So a 300 ppi save as PNG from Photoshop would embed a...
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Photoshop Export/Quick Export strips the resolution metadata, as does Export/Save for Web (Legacy). Photoshop Save As will retain resolution metadata.
The official PNG specification for the PNG resolution unit is in metres (not inches). So a 300 ppi save as PNG from Photoshop would embed a value of 11811 ppm (pixels per metre). When Photoshop opens a PNG with this resolution metadata, it performs a “translation” from pixels per metre to PPI:
118.11 x 2.54 = 299.9994 ppi, rounded up to 300 ppi.
If there is no resolution metadata embedded in the file, then Photoshop defaults to 72 ppi.