I have images that I generate via ImageMagick that are supposed to have a non-square pixel ratio.
Photoshop seems to be able to detect that the pixel ratio is not square (I see that there is a custom pixel ratio set up) but I cannot tell where the ratio came from, as it is different from the resolution I set.
So the question is - where does Photoshop get the pixel ratio from?
This the output from
Image: strange.png Format: PNG (Portable Network Graphics) Mime type: image/png Class: DirectClass Geometry: 734x995+0+0 Resolution: 23.63x36.52 Print size: 31.0622x27.2453 Units: PixelsPerCentimeter Type: TrueColor Endianess: Undefined Colorspace: sRGB Depth: 8-bit Channel depth: red: 8-bit green: 8-bit blue: 8-bit Channel statistics: Pixels: 730330 Red: min: 25 (0.0980392) max: 255 (1) mean: 182.009 (0.71376) standard deviation: 87.5167 (0.343203) kurtosis: -1.61776 skewness: -0.485718 entropy: 0.342994 Green: min: 38 (0.14902) max: 255 (1) mean: 188.828 (0.740503) standard deviation: 72.5125 (0.284363) kurtosis: -1.26545 skewness: -0.481082 entropy: 0.357498 Blue: min: 0 (0) max: 255 (1) mean: 150.706 (0.591004) standard deviation: 110.202 (0.432163) kurtosis: -1.67965 skewness: -0.294347 entropy: 0.346663 Image statistics: Overall: min: 0 (0) max: 255 (1) mean: 173.848 (0.681756) standard deviation: 91.3995 (0.35843) kurtosis: -1.14615 skewness: -0.580943 entropy: 0.349052 Rendering intent: Perceptual Gamma: 0.45455 Chromaticity: red primary: (0.64,0.33) green primary: (0.3,0.6) blue primary: (0.15,0.06) white point: (0.3127,0.329) Background color: white Border color: srgb(223,223,223) Matte color: grey74 Transparent color: black Interlace: None Intensity: Undefined Compose: Over Page geometry: 1021x1103+218+58 Origin geometry: +218+58 Dispose: Undefined Iterations: 0 Compression: Zip Orientation: Undefined Properties: date:create: 2016-01-26T09:42:53+01:00 date:modify: 2016-01-26T09:42:53+01:00 png:bKGD: chunk was found (see Background color, above) png:cHRM: chunk was found (see Chromaticity, above) png:gAMA: gamma=0.45454544 (See Gamma, above) png:IHDR.bit-depth-orig: 8 png:IHDR.bit_depth: 8 png:IHDR.color-type-orig: 2 png:IHDR.color_type: 2 (Truecolor) png:IHDR.interlace_method: 0 (Not interlaced) png:IHDR.width,height: 734, 995 png:oFFs: x_off=218, y_off=58 png:pHYs: x_res=2363, y_res=3652, units=1 png:sRGB: intent=0 (Perceptual Intent) png:text: 2 tEXt/zTXt/iTXt chunks were found png:tIME: 2016-01-26T09:42:53Z png:vpAg: width=1021, height=1103 signature: 4be6c7cdfbf701380737943a2363a747c47da9281caba9fe053da6ca0e89b2e3 Artifacts: filename: strange.png verbose: true Tainted: False Filesize: 114KB Number pixels: 730K Pixels per second: 365.17GB User time: 0.000u Elapsed time: 0:01.000 Version: ImageMagick 6.9.2-10 Q16 x86_64 2016-01-21
and the custom pixel ratio automatically set up in Photoshop is 1.533, although, given a resolution of 23.63x36.52, I should have something like 1.545, which is 36.52 / 23.63.