Legacy ImageMagick Discussions Archive

Thanks, fmw42 and snibgo!

Testing TIFF64 now, and yes, it is supported in libtiff 4.0.10_1 (which I am using), and I believe, supported since libtiff 3.8.2.

UPDATE:
50000 x 28125 @ dpi90 tiff file = 16.88 Gbytes

converted from .PSB file with this call:
magick in.psb -define quantum:"format ...

Not the same. Search Google or check http://bigtiff.org and https://www.awaresystems.be/imaging/tiff/bigtiff.html


Thank you for the second set of information (I'd already been made aware of bigtiff.org by magick,
but neither of the links instruct me on how to call BigTIFF output in IM.

I tried ...

Standard TIFF file is limited to 4GB. The bigtiff delegate library can write BigTIFF files, which contain 64-bit offsets to directories and image data. For a BigTIFF file there is no practical limit to the size of a file.


Thanks, magick.
I have libtiff 4.0 installed for my tiff delegates.

I ...

Here is my IM info:
Version: ImageMagick 7.0.8-59 Q16 x86_64 2019-08-05 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP(3.1)
Delegates (built-in): bzlib freetype heic jng jp2 jpeg lcms ...

convert IN.exr -define quantum:format=floating-point -colorspace RGB OUT.tif
... in converting from exr, the resulting gamma is off, ...
You use v7. I suggest you use "magick", not "convert".

Assuming IN.exr is encoded as sRGB, your "-colorspace RGB" will convert it to linear RGB. That is, the ...

TIFF and MIFF and MPC also support HDRI. With TIFF and MIFF, you need to add -define quantum:format=floating-point


Tiff
Thank you, Fred. This helped me get tiff output at 32bit with a simple convert like this:
convert IN.exr -define quantum:format=floating-point -colorspace RGB OUT.tif ...

Standard TIFF file is limited to 4GB. The bigtiff delegate library can write BigTIFF files, which contain 64-bit offsets to directories and image data. For a BigTIFF file there is no practical limit to the size of a file.



Thanks for that heads up.

Do you know the image library name to add ...

The tiff format has a file size limit of 4 Gbytes. For the work I am doing (very large files for print), tiff is not really an option.
My best hope, so far, is that the PSD format will be corrected to allow 32bit floating point mode in IM.

- Jimbo

Thanks for that clarification. Are the IM formats MIFF and MPC getting more widely adapted by other software?

- Jimbo

I'm a little confused about the DPX specs that this thread has mentioned.
DPX has both a Log and Linear specification, and can be created or read as either.
A Log to Lin conversion would be necessary, if the original file is in Log space and the user would like to
use the linear space available at ...

Interesting. I wonder if anything else can read them. I will try and report.
Also, snibgo, what version of IM are you using?

Update: started working on this, and the first tiff limit I found was mentioned by Photoshop. tiff file format has a 4 Gbyte limit.
More to come...
- J

By the way, as far as setting dpi for images...
Many image formats simply do not have 'dpi' as part of their specification; EXR and PFM being two of them.

Using '-set':
So, even if you figure out how to declare dpi followed by an integer value and add it to the image's header using "-set," it is ...

By the way, of the HDRI supported image formats: Tiff, Pfm, and EXR, only Tiff allows a dpi (-density, -units PixelsPerInch) setting in its header.
PSD/PSB allows dpi settings, but IM only creates 8 or 16bit version of this format currently, so it does not support HDRI.

See this thread: https://www ...

@fmw42, as you stated in the other thread "Change DPI while keeping resolution,"
https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=20347&p=168523#p168523
my version of ImageMagick is Q16 HDRI. I'm on a Mac OS X v10.14.5 (Mojave).

I have not tried Q32 because I'm not sure how to add ...

I sent a message to Weary Wanderer to see if he would clue me in on how the header needs to be output for the psd 32 bit depth, so I could try the compile that he did a few weeks ago, but I will need to want on that. Doubt if I could figure it out without a similar example.

- J