Fw: RGB merge

[Harry Parker]

Hi again Bill,

Looks like the ImageJ server scrambled my HTML message. Here it is again in plain text.
 

--  

Harry Parker  

Senior Systems Engineer  

Digital Imaging Systems, Inc.



----- Forwarded Message ----


Subject: Re: RGB merge



Hi Bill,



I looked into software for doing this and making high dynamic range (HDR) images out of them, about 18 months ago.



As Jonathan mentioned, ImageJ can create a 16 bit per channel RGB stack from R, G, and B images and save that as a 48 bit /pixel TIFF file.



ImageJ is the best software I've found for analyzing images, but others do a better job at manipulating color images.



Here is a list of software I've read about that can read that image and do something with it. I've only listed software that works on Mac OS X (but they mostly work on Windows & other Unix OS's as well):



Free & Open Source:


    1. ImageMagick  (the command line software you mentioned)

         * Can only handle 16 bit / sample when built with the 16 bit configuration build option,
              so the prebuilt binary may not work for you

         * http://www.imagemagick.org/script/index.php
    2.  FREEIMAGE - C library w/ a few samples
        * freeimage.sourceforge.net/
    3.  Netpbm - another command line tool set for converting to & from PFM and PPM
    4.  nip2 & vips -

        * Free, Scriptable, spreadsheet i/f w/ good CIE color support
        * www.vips.ecs.soton.ac.uk/index.php
    5.  PFSTools w/ PFStmo - Handles 48 bit RGB TIFF as input only

        * handles colorimetry

        * Octave integration

        * library w/ C++ API

        * many tone mapping algs
        * www.mpi-sb.mpg.de/resources/pfstools/
        * gave compile errors on my Mac 10.3.9 OS when I tried it last


Commercial:


    1.  Photomatix - $99 -

        *  http://www.hdrsoft.com/index.html
    2.  PhotoShop CS2 - $699 or $150 upgrade  
        *  www.adobe.com

    3.  Pixel image editor -   Beta for $38
        *  http://www.kanzelsberger.com/pixel/?page_id=12


Hope this information helps you.



On a related ImageJ topic, I've written a plugin that can take a 10 bit per color (i.e. 0 to 1023) linear intensity RGB image (stored in a 3 slice 16 bit stack) and transform it into a standard 24 bit RGB image after applying the standard sRGB gamma function to the colors, so the intensities will appear correct on a standard or calibrated monitor.  I haven't posted it as it works correctly only for 10 bits per color images only. Does anyone have an interest in that?



--  

Harry Parker  

Senior Systems Engineer  

Digital Imaging Systems, Inc.



----- Original Message ----

From:  Jonathan Hilmer <[hidden email]>

To: [hidden email]

Sent: Wednesday, March 21, 2007 11:50:19 AM

Subject: Re: RGB merge



You can use ImageJ to export a RGB as a three-layer grayscale stack in

a RAW format, followed by import as a RGB RAW in other software.  It's

not very convenient, but it works.



Jonathan





On 3/21/07, Bill Christens-Barry <[hidden email]> wrote:

> On the subject of merging images to form an RGB, I'm looking for a means to combine three 16-bit

> monochrome images into an RGB image that retains 16-bits per channel (not surrently supported in

> ImageJ if I understand correctly).

>

> Can anyone suggest a way? Currently, I'm exploring ImageMagick, but am having some libtiff

> installation issues on my Intel Mac.

>

> Thanks.

>

> Bill Christens-Barry







 
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