How can I make Adobe Bridge read the dimensions and resolution of PNG files the same way as Photosho

[QIANG272358929ck4]

Why does Adobe Bridge show different dimensions and resolution for PNG files compared to what is shown in Photoshop, while other file formats (like JPG, TIFF) are consistent? How can I make Adobe Bridge read the dimensions and resolution of PNG files the same way as Photoshop does?

[Stephen Marsh]

Can you link a sample of the file?

[QIANG272358929ck4]

Differences in resolution result in inability to accurately determine physical print size

[Stephen Marsh]

Yes, you have inconsistent metadata.

Using ExifTool, I can see that you have the following:

[PNG-pHYs] PixelsPerUnitX : 2835
[PNG-pHYs] PixelsPerUnitY : 2835
[PNG-pHYs] PixelUnits : meters

[XMP-tiff] XResolution : 300
[XMP-tiff] YResolution : 300
[XMP-tiff] ResolutionUnit : inches

28.35 PPM x 2.54 (metric to inch) = 72.009 rounded to 72 PPI.

In the simplest form of a PNG, the entries in red are unnecessary. Bridge and Photoshop will translate and round the PNG specification pixels per metre values into inches.

If the XMP-tiff entries in red are in the file, then Photoshop ignores them, while Bridge uses them, leading to the discrepancy in reported print size/resolution.

So, you can batch open/resave the PNG files in Photoshop which should correct and normalise the display between Photoshop and Bridge (whether leaving the resolution at 72 PPI or adding a step to resize without resampling to 300 PPI), or edit the metadata using ExifTool to remove the mismatch, either removing the XMP-tiff entries or changing the PNG-pHYs entries to use a value of 11811 PPM (118.11 PPM x 2.54 = 300 PPI).

[QIANG272358929ck4]

Thank you for your answer If you re-save in PS, the saved PNG file will still look like 300 PPI in Bridge, and I want this image to show 72 ppi in Bridge as a PNG as well, to keep it consistent with the 72 ppi in PS.  

[Stephen Marsh]

Thank you for your answer If you re-save in PS, the saved PNG file will still look like 300 PPI in Bridge, and I want this image to show 72 ppi in Bridge as a PNG as well, to keep it consistent with the 72 ppi in PS.  

By @QIANG272358929ck4

This wasn't the result of my tests. Photoshop ignores the incorrect TIFF 300ppi metadata and open at the PNG resolution of 72ppi. Either using Export As or Save As resulted in the PNG file showing 72ppi in Bridge. And again, ExifTool can either remove the TIFF resolution metadata or change it from 300ppi to 72ppi.

P.S. Ideally you need to investigate where and why this is happening and if possible stop it at the source, is it Photoshop Elements or elsewhere in your workflow or the history of the files.

[QIANG272358929ck4]

Thanks for your answer

[ExUSA]

Resolution metadata in PNG files has been a longstanding problem. There may not BE resolution data in many PNG files, and the default resolution is not consistent across apps. You can use EXIFTool to take a closer look at problem files.

[QIANG272358929ck4]

2003x1335px  PS 72 ppi    Bridge 300ppi

Differences in resolution result in inability to accurately determine physical print size