On 7/10/24 6:38 AM, Ulf Zibis via Tiff wrote:
I have some TIFF files with DPI=150 and =200, compressed with FAX G4,
format/size DIN A4, which I want to convert to PDF.
With no special options the resulting PDF has only DPI=96 and the
picture solution is reduced accordingly, so information is lost.
I'm not able to reproduce this.
How are you determining that the resulting PDF only has 96 dpi?
How are you determining that your original TIFFs are 150 dpi or 200 dpi?
I've constructed a G4 TIFF image with 200x200 dpi:
./tiffinfo a4-200dpi.tif
=== TIFF directory 0 ===
TIFF Directory at offset 0x5ee (1518)
Subfile Type: (0 = 0x0)
Image Width: 1653 Image Length: 2339
Resolution: 200, 200 pixels/inch
Bits/Sample: 1
Compression Scheme: CCITT Group 4
Photometric Interpretation: min-is-white
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 1
Rows/Strip: 64
Planar Configuration: single image plane
DocumentName: a4-200dpi.tif
ImageDescription: A4 200x200 dpi
./tiff2pdf -o a4-200dpi.pdf a4-200dpi.tif
pdfimages -list a4-200dpi.pdf
page num type width height color comp bpc enc interp object ID
x-ppi y-ppi size ratio
--------------------------------------------------------------------------------------------
1 0 image 1653 2339 gray 1 1 ccitt no 7 0
200 200 1314B 0.3%
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