Scaling seems off for some PDFs containing images

[sanketr]

The scaling to A4 size for the attached pdf seems off (on Mac Darwin Kernel Version 23.6.0). Perhaps it has something to do with images in pdf.

Sample run:

$ ./pdfScale.sh -v -r A4 -a none out.pdf
pdfScale.sh v2.6.3 - Verbose Execution
Single Task: Resize PDF Paper
Dry-Run: FALSE
Input File: out.pdf
Output File: out.A4.pdf
Explode PDF: Disabled
Get Page Size: Adaptive Enabled
Method: Grep
Page Range: None (all pages)
Source Width: 330 postscript-points
Source Height: 566 postscript-points
Print Mode: Print ( auto/empty )
Scale Factor: Disabled (resize only)
Fit To Page: Enabled (default)
Auto Rotate: None
Flip Detect: No change needed
Run Resizing: A4 ( 595 x 842 ) pts
Final Status: File created successfully

'pdfinfooutput shows scaling is 490x841 instead.gs` will have the same behavior when device width and height are set. This is very puzzling.

$ pdfinfo ./out.A4.pdf

...

Pages: 2
Encrypted: no
Page size: 490.363 x 841.97 pts
Page rot: 0
File size: 873704 bytes
Optimized: no
PDF version: 1.5

It seems something specific to interaction between gs and the attached pdf. Preview on Mac will scale it fine to correct size when A4 size is set in print option.

out.pdf