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UriDavid
Known Participant
March 27, 2018
Question

CS6 resolution issues while saving PSD as PNG

  • March 27, 2018
  • 4 replies
  • 971 views

On PS CS6 a psd file has 4500X5400 pix and 300 ppi. when saving to PNG and reading the file the 4500X5400 remain ok but the PPI changed to 299.999.

this happened suddenly, since i could save PNG in 300PPI in the past.

anything might changed in photoshop parameters/preferences/scripting fils???? any ideas???

please help i need my files to be save as 300 PPI for my work.

Thanks

This topic has been closed for replies.

4 replies

T
Test Screen Name
Legend
March 28, 2018

No, nothing is messed up. I asked, did you actually try your service (that supposedly will reject your PNG)?

T
Test Screen Name
Legend
March 28, 2018

Have you actually tried your service?

T
Test Screen Name
Legend
March 28, 2018

Just normal rounding. Ppi isn’t exact in PNG because it’s metric. Try not to worry.

@mj
Community Expert
@mjCommunity Expert
Community Expert
March 28, 2018

Good advice from Test Screen Name.

PNG can only store resolution in dots per meter (dpm)

It's an Imperial (dpi) to metric (dpm) conversion that takes place. PNG format resolution is captured as dots per meter. When dpi is converted to dpm floating point math is done by Photoshop. This is not 100% accurate.

300 dpi is approx 11811 dpm

11811 dpm translates299.9994 dpi

You can try this yourself at Convert dot/meter [dot/m] <—> dot/inch [dpi] • Photometry — Light • Digital Image Resolution • Compact Calculator

There is a minuscule difference between 300 and 299.99 dpi. Practically indiscernible.

Don't lose sleep over it.

HTH

U
UriDavidAuthor
Known Participant
March 28, 2018

Thank you, i already read all about the ppi dpi metric inches conversion but the thing is that a week ago i did not have any problem saving PNG with 300 ppi and now i have a problem.

somehow Photoshop is messed up and i don't  know how to correct it

JJMack
Community Expert
JJMackCommunity Expert
Community Expert
March 28, 2018

Have you tried using Image size with resample NOT check set 300 DPI print resolution click OK.  The number of pixels will not change if yoy do not resample. Record an action set 300 dpi.

JJMack
U
UriDavidAuthor
Known Participant
March 28, 2018

Yes, i did try to uncheck the resample, did not help.

this issue happen suddenly and my guess is that something what wrong with photoshop. i read that scripting may be changed

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