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PaoloT

Imported TIFF image with wrong dpi resolution

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Hi,

When placing a TIFF file into a Publisher document, the dpi of the image is the wrong one. Publisher says it is a 300dpi image. Both APhoto, Photoshop and Apple Preview say it is a 72dpi image.

When resizing it in Publisher (menu on the top right of the window), the Scale value is increased over 100%. If I make it 72dpi, it is now a 417% of the original file. If clicking Original Size, I'm back with a 300dpi image.

Did I something wrong, or is there a bug somewhere?

Paolo

Publisher 1.8.2 Mac.

 

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I just experience some similar vice versa for a JPG: the image exif says 300 dpi – APub Resource Manager says 72 dpi.
It doesn't occur with a TIFF of the same image file.

1480721044_dpiresolutionvaryingvalues.jpg.3f7d5cc10e7cb34fbc244e6ac023cc2a.jpg


It reminds me to this known issue:

 


macOS 10.14.6, Macbook Pro Retina 15" + Eizo 24"

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Here is an example for a BMP file (1-bit, saved in PSD).

Exif resolution: 72 dpi  –  APub: 1523 dpi

23261411_dpiresolutionvaryingvaluesBMP1.jpg.dabba450f3600b92704c192913a3f6b8.jpg   <–>   1487264562_dpiresolutionvaryingvaluesBMP2.jpg.9b0838667bdab796bd24a704a00e88cb.jpg

 


macOS 10.14.6, Macbook Pro Retina 15" + Eizo 24"

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1 hour ago, Gabe said:

Can you attach the sample files and/or the afpub file so we can have a look?

Yes. For example, this one is a screen grab at 72dpi on the Mac. Even APhoto says it is a 72dpi image. But APublisher says it is a 300dpi image.

Paolo

 

write-favorite-dlg.tif

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If I Place your image into a 300dpi Publisher document, and use the Move Tool's Context Toolbar options to make it the "original size", I see the following:

image.png.3506661f5f1a731f4e0d4edd52191055.png

Note that the Resource Manager says 300dpi in the blue-highlighted bar, but the details on the right show the original dpi is 72.

In the Context Toolbar:
image.png.e64b2716655f4f6d932cc443a96348e9.png

The image in the document (at Original Size) is about 1.5 inches wide. At 72 dpi it would be about 6.27 inches, which seems more like the proper "original" size. I'm not sure what's going on...

 


-- Walt

Windows 10 Home, version 1909 (183623.476),
   Desktop: 16GB memory, Intel Core i7-6700K @ 4.00GHz, GeForce GTX 970
   Laptop:  8GB memory, Intel Core i7-3625QM @ 2.30GHz, Intel HD Graphics 4000 or NVIDIA GeForce GT 630M
Affinity Photo 1.8.3.641 and 1.8.4.650 Beta   / Affinity Designer 1.8.3.641 and 1.8.4.650 Beta  / Affinity Publisher 1.8.3.641 and 1.8.4.651 Beta.

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17 minutes ago, MikeW said:

I haven't tried in APub. But the image is 72 dpi...or is not actually recorded in the file.

It is a 72 dpi image, but it is treated by APub as a 300 dpi one. Apart for the information box reported by @walt.farrell here above.

Paolo

 

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7 minutes ago, PaoloT said:

It is a 72 dpi image, but it is treated by APub as a 300 dpi one. Apart for the information box reported by @walt.farrell here above.

Paolo

I myself don't know of a way around the issue when placing an image. Affinity applications (at least AD/APub) will always use the document dpi to initially size an image.

I once railed about this issue of having a document dpi. At least as regards APub, but in AD as well. Document dpi in a vector-based application should be limited to a raster effects default resolution.

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12 minutes ago, MikeW said:

Affinity applications (at least AD/APub) will always use the document dpi to initially size an image.

That's part of what is strange about that "Original Size" button, Mike.

If we have a 72dpi image that (given its pixel dimensions) should be 6.27 inches wide, then Original Size could:

  1. Place it at 300 dpi but 6.27 inches wide; or
  2. Place it at 72dpi at 6.27 inches wide.

But it shouldn't place it at 300dpi and 1.6 inches wide, as it did for me. That can't possibly be "original size", can it, regardless of how we define size?


-- Walt

Windows 10 Home, version 1909 (183623.476),
   Desktop: 16GB memory, Intel Core i7-6700K @ 4.00GHz, GeForce GTX 970
   Laptop:  8GB memory, Intel Core i7-3625QM @ 2.30GHz, Intel HD Graphics 4000 or NVIDIA GeForce GT 630M
Affinity Photo 1.8.3.641 and 1.8.4.650 Beta   / Affinity Designer 1.8.3.641 and 1.8.4.650 Beta  / Affinity Publisher 1.8.3.641 and 1.8.4.651 Beta.

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That image, with the number of pixels, shouldn't ever place at the size of your #1 point.

It should place as in your point #2. Like it does in every non-Affinity application I use...including Serif's PagePlus (when choosing Place at native dpi).

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4 hours ago, Gabe said:

Can you attach the sample files and/or the afpub file so we can have a look?

In this .zip (34 kB) are the 2  images from my post above:   Archiv.zip

Note also this previous thread which mentioned already the unwanted/unexpected issue of placed image sizes, in particular low res images like screenshots:

 


macOS 10.14.6, Macbook Pro Retina 15" + Eizo 24"

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