Legacy ImageMagick Discussions Archive

I guess it depends upon the app reading the image. I suspect photoshop will still look to its Tiff:resolution of 300:1.

I don't know how other apps will see it. You could try other viewers (GIMP, Firefox, Safari, etc) or just print the file and see if it is now at 72 dpi or not.

Alternately, add ...

Well, that is not what I expected. The IM density is still 300 and the TIFF resolution has been remove.

What version of IM are you using?


try without the resize.

convert source.tif -units PixelsPerInch -density 72x72 -quality 100 target.jpg
and
convert source.tif -density 72x72 -units ...

identify -verbose output


Image: kortinlukija_435px.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 435x290+0+0
Resolution: 300x300
Print size: 1.45x0.966667
Units: PixelsPerInch
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 8 ...

identify -verbose source.tif

This is a rather long listing, but here it is. To me it seems the resolution is 300 dpi all the way.


Image: 4055a89a4de4da521091d84c09b97ad9.tif
Format: TIFF (Tagged Image File Format)
Class: DirectClass
Geometry: 5616x3744+0+0
Resolution: 300x300
Print size ...

Hi,

I'm trying to convert TIFF -image to JPG -image with the following command, but the density just doesn't seem to change:
convert source.tif -resize 435x290 -units PixelsPerInch -density 72x72 -quality 100 target.jpg
Source TIFF is 300 dpi, 5616x3744 pixels, 60.2MB file.
What I'm trying to do ...