Update README.md

Author: michaeldsmith

README.md

@@ -41,13 +41,16 @@ the same CTL program can apply the same transform to an image.
 ## Package Contents ##
 The CTL source code contains the following:
 
-* `lib/` - CTL libraries and the CTL interpreter 
-* `doc/` - CTL documentation
-* `OpenEXR_CTL/` - sample CTL applications utilizing IlmImfCtl
+* `.github/` - github CI workflow files
+* `cmake/` - cmake support files
 * `ctlrender/` - an application that allows for application of CTL transforms to
   an image using one or more CTL scripts, potentially converting the file format
   in the process.
-* `config/` - CMake configuration files
+* `doc/` - CTL documentation
+* `docker/` - dockerfiles that compile CTL on various platforms 
+* `lib/` - CTL libraries and the CTL interpreter 
+* `OpenEXR_CTL/` - sample CTL applications utilizing IlmImfCtl
+* `resources/` - scripts and support files for unit tests
 * `unittest/` - unit test files
 
 ## Installation Prerequisites ##
@@ -76,39 +79,8 @@ below.
 
             $ brew install cmake
 
-__IlmBase__
-
-The CTL interpreter depends on the IlmBase software package, which can be
-downloaded from http://www.openexr.com or use one of the commands below.
-
-* Ubuntu
-
-        $ sudo apt-get install libilmbase-dev
-
-* Redhat
-
-        $ yum install ilmbase-devel
-
-* OS X
-
-    * Install homebrew if not already installed
-
-            $ ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
-            
-    * Install ilmBase
-    
-            $ brew install ilmBase
-
-### Suggested ###
-
 __OpenEXR__
 
-If you want to use CTL together with the OpenEXR image file format, you should
-download OpenEXR. The sample programs included with the CTL package (i.e.
-ctlrender, dpxexr, exr_ctl_exr, etc.) require that OpenEXR be installed. OpenEXR 
-can be downloaded from http://www.openexr.com/downloads.html or using one of the 
-commands below.
-
 * Ubuntu
 
         $ sudo apt-get install libopenexr-dev
@@ -127,17 +99,19 @@ commands below.
 
             $ brew install openexr                        
 
+### Suggested ###
+
 __TIFF__
 
-If you want to use CTL together with the TIFF image file format, you should download libTiff. libTiff can be downloaded from http://www.remotesensing.org/libtiff/ or using one of the commands below.
+If you want to use CTL together with the TIFF image file format, you should download libTiff. libTiff can be downloaded from [http://www.remotesensing.org/libtiff/](https://libtiff.gitlab.io/libtiff/) or using one of the commands below.
 
 * Ubuntu
 
         $ sudo apt-get install libtiff-dev
 
 * Redhat
 
-        $ yum install libtiff4
+        $ yum install libtiff-devel
 
 * OS X