Any format to TIFF 600 DPI not possible with IM ?

Post by **anthony** » 2005-11-09T23:40:59-07:00

It was more likely the tiff was lying to IM.

TIFF is a crazy format of old obsolete profiles and addons developed from the days before JPEG's and PNG's were invented. Avoid it if posible.

Please note that the resolution or dpi of an image is completely irrelevent to the images size. It is just a set of numbers stored with the image to tell output devices such as printers and displays how many dots (or pixels) per inch the image should be displayed at, or for vector formats like postscropt, pdf, MWF, the pixel scale to draw the image in.

You can set and or change the resolution of an image as it is being read into IM by using the -density function.

EG: convert -density 600x600 image.tif new.tif

Post by **anthony** » 2005-11-12T22:30:16-07:00

Strip profiles with -strip
Easy

Post by **anthony** » 2005-11-13T16:31:47-07:00

The "-strip" option will remove all the profiles from an image, including the one holding the photoshop resolution of the image. Once that profile is removed photoshop should (as per the online manual for "-density" says), understand the new density resolutions you set.

I do not know the name of the actual profile you need to strip, so I can't give you a more specific "+profile 'name'" option. Anyone out there know so we can update the manual?

Some alturnatives for profile editing include..

Code: Select all

  perl ExifTool       http://www.sno.phy.queensu.ca/~phil/exiftool/
  winGUI ExifTool  http://www.dalibor.cz/minolta/exiftool.htm
  Exifer                http://www.exifer.friedemann.info/

Please let me know what you do an find, as this is an area I am not concentrating on with the examples, as profiles is less IM specific.

Post by **anthony** » 2005-11-14T18:48:09-07:00

If -strip does not work you probably have a version 5 IM, upgrade!

If you can't upgrade try +profile '*' to strip all profiles.

Post by **anthony** » 2005-11-14T20:15:59-07:00

Put -density BEFORE reading the image in.

Post by **anthony** » 2005-11-15T16:49:09-07:00

No idea about RemoveImageProfile download an try it.

Post by **anthony** » 2005-11-29T17:55:36-07:00

More like a bug of the TIFF format which has been hacked by just about every windows image program. The format should be phased out!

Post by **anthony** » 2005-11-30T20:53:34-07:00

No I mean before JPEG and PNG came about lots of programs, including photoshop and coreldraw added junk to the image format for their own purposes which were not (and probably will never be) understood by other programs. It has had every sort of compression and internal formating just tacked on, and generally it was all done without any control of features.

For a 'interchange file format' (IFF) it is horrible, and I every time I used it I have lost more hair!

It is a hack! Avoid it if you can!

Post by **anthony** » 2005-12-01T20:58:37-07:00

I haven't seen, or even know what the -unit option is for!

andyroo · Post by **andyroo** » 2005-12-07T20:58:39-07:00

I've been struggling with a similar problem as to what has been described in this thread, except with the montage command. I can get convert to work fine, with the output image defined correctly as 300 dpi, but can't seem to nail it with the montage command. The -unit argument as described here isn't valid with montage, although I'm very thankful that it was mentioned in this thread! My workaround has been to use montage first, then issue the convert command separately to set the image resolution, as follows:

montage -density 300x300 infilename.eps -page 5100x3300 -tile 7x -geometry +25+10 outfilename.tif (output image here says 72 dpi)

convert -density 300x300 -units PixelsPerInch infilename.tif outfilename.png (output image here says 300 dpi, the desired result)

Any possibility of combining these into a single command line? I'm using ImageMagick-6.2.5-Q16, which I only just downloaded a couple of weeks ago.

Thanks,

Andrew

Post by **anthony** » 2005-12-07T21:07:35-07:00

Request it and -unit can be added to montage.

However did you know convert can save images into the source image filename without problems?

No need for a temporary file if you are sure you have it working correctly.

andyroo · Post by **andyroo** » 2005-12-08T11:45:10-07:00

That's good to know re: the temporary file; thanks for pointing that out.

I assume I should make such a request in the "bugs" forum (?), even though it's not really a bug in the strictest sense.

Cheers,

Andrew

Post by **anthony** » 2005-12-08T18:40:48-07:00

Montage should understand all convert options exept those whcih are montage specific. EG -frame -convert -tile. Settings (including -geomerty) are
fine and can not be used for both purposes.

See IM examples 'montage' page.

andyroo · Post by **andyroo** » 2006-02-28T08:52:37-07:00

Anthony,

I followed up with a bug report as you suggested, waited patiently for imagemagick 6.2.6 to be released, installed it and tested the montage command and it still doesn't work. The -units option is now recognized by montage, but it doesn't seem to do anything... I posted another bug report as per the link below, but haven't received a response. Is this a bug in the software, or am I doing something wrong in the command line?

My bug report is here, with examples of what I've tried already:

http://redux.imagemagick.org/discussion ... php?t=5463

Thanks,

Andrew

Legacy ImageMagick Discussions Archive

Any format to TIFF 600 DPI not possible with IM ?

Set output dpi with montage command?

montage with -units option