Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
TIFF to JPEG conversion kills dpi
#3
The solution is as Blighty points out, go into Image -> Print Size and change the resolutions. This does not scale the image in any way but you will see the width and height adjust.

However, always a however Wink

I can not reproduce that here. Gimp 2.8.20 Kubuntu 16.04

Scanning with xsane in a couple of different formats grey @ 300 ppi colour @ 200 ppi and
1. The correct ppi is reported by ImageMagick in both cases.
2. Gimp opens these with the correct ppi

It could be the format of the tiff file, There are many 'flavours' of tiff including compression. xsane saved both using jpeg compression. Maybe one of the alternatives gives a different result.

It is worth running one of your files through ImageMagick identify -verbose filename.tif just to see what is there. example:

Quote:Image: gray.tiff
 Format: TIFF (Tagged Image File Format)
 Mime type: image/tiff
 Class: DirectClass
 Geometry: 2320x3468+0+0
 Resolution: 300x300
 Print size: 7.73333x11.56
 Units: PixelsPerInch
 Type: Grayscale
- - - - - - -
edit: Nope, no change, tried uncompressed tiff and a packbits tiff. Open in Gimp, export to jpeg and the original ppi stays the same.
Reply


Messages In This Thread
RE: TIFF to JPEG conversion kills dpi - by rich2005 - 04-21-2017, 11:28 AM
RE: TIFF to JPEG conversion kills dpi - by Kevin - 04-21-2017, 12:01 PM
RE: TIFF to JPEG conversion kills dpi - by david - 04-22-2017, 06:07 PM
RE: TIFF to JPEG conversion kills dpi - by Ofnuts - 04-22-2017, 08:58 PM
RE: TIFF to JPEG conversion kills dpi - by david - 04-22-2017, 10:08 PM
RE: TIFF to JPEG conversion kills dpi - by Ofnuts - 04-22-2017, 11:25 PM
RE: TIFF to JPEG conversion kills dpi - by Ofnuts - 04-23-2017, 07:54 AM

Forum Jump: