Major compression performance/quality improvements, for a 15-35% or so decrease in file size for the same Y PSNR/SSIM. The basis file format has changed due to these optimizations.

Increasing the max codebook size to 16K vs. 8K, for a major increase in the max achievable quality.
Adding exception catching to command line tool.
Enabling debug iterators on MSVC.
Refining command line options, adding "-individual" flag to create multiple .basis files (vs. a texture array).
Changing default colorspace to sRGB, because that's probably the best default. -linear disables this and uses linear colorspace metrics.
PNG reader in 32-bit builds checks the size of the file before loading to avoid out of memory exceptions.

Author: richgel999

basisu.vcxproj

@@ -85,7 +85,6 @@
       <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
-      <ExceptionHandling>false</ExceptionHandling>
       <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
@@ -99,7 +98,6 @@
       <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
-      <ExceptionHandling>false</ExceptionHandling>
       <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
@@ -116,7 +114,6 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <ExceptionHandling>false</ExceptionHandling>
       <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
@@ -137,7 +134,6 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <ExceptionHandling>false</ExceptionHandling>
       <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>