Search found 23 matches

by Jimbo
2019-09-16T17:25:27-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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=floating-...
by Jimbo
2019-09-16T16:41:03-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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: mag...
by Jimbo
2019-09-16T14:48:43-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 see in ...
by Jimbo
2019-09-16T14:41:09-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 ...
by Jimbo
2019-09-12T16:48:03-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 enco...
by Jimbo
2019-09-08T16:05:12-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 Although, in...
by Jimbo
2019-09-08T15:32:27-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 bigTiff t...
by Jimbo
2019-09-07T16:48:31-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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
by Jimbo
2019-09-07T12:07:20-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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

- Jimbo
by Jimbo
2019-09-07T11:38:00-07:00
Forum: Users
Topic: convert DPX 10 bit Log to Lin
Replies: 11
Views: 28036

Re: convert DPX 10 bit Log to Lin

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 m...
by Jimbo
2019-09-06T11:25:15-07:00
Forum: Magick++
Topic: RE: Combining HDR/EXR files into a single PSD
Replies: 15
Views: 12819

Re: RE: Combining HDR/EXR files into a single PSD

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 Jimbo
2019-09-06T10:20:43-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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 lik...
by Jimbo
2019-09-05T14:25:12-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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....
by Jimbo
2019-09-05T14:21:40-07:00
Forum: Magick++
Topic: RE: Combining HDR/EXR files into a single PSD
Replies: 15
Views: 12819

Re: RE: Combining HDR/EXR files into a single PSD

@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 th...
by Jimbo
2019-09-04T19:19:48-07:00
Forum: Users
Topic: Change DPI while keeping resolution
Replies: 32
Views: 31081

Re: Change DPI while keeping resolution

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