Features:

--Add support for Exr files which use 32-bit floats for each RGBA channel. Seems to come out too washed out.
--Allow for clearing an individual color curve.
--Allow for saving multiple image types in EmberRender and EmberAnimate. All writes are threaded.
--Remove --bpc command line argument. Add format png16 as a replacement.
--Remove --enable_jpg_comments and --enable_png_comments command line arguments, and replace them with --enable_comments which applies to jpg, png and exr.
--Add menu items to variations and affine spinners which allow for easy entry of specific numeric values like pi.
--Make final render dialog be wider rather than so tall.

Bug fixes:
--Fix some OpenCL compile errors on Mac.
--Remove ability to save bitmap files on all platforms but Windows.

Code changes:
--New dependency on OpenEXR.
--Allow Curves class to interact with objects of a different template type.
--Make m_Curves member of Ember always use float as template type.
--Set the length of the curves array to always be 2^17 which should offer enough precision with new 32-bit float pixel types.
--Set pixel types to always be 32-bit float. This results in a major reduction of code in the final accumulation part of Renderer.h/cpp.
--Remove corresponding code from RendererCL and FinalAccumOpenCLKernelCreator.
--Remove Transparency, NumChannels and BytesPerPixel setters from Renderer.h/cpp.
--Add new global functions to format final image buffers and place all alpha calculation and scaling code in them.
--Blending is no longer needed in OpenGLWidget because of the new pixel type.
--Make new class, AffineDoubleSpinBox.
--Attempt to make file save dialog code work the same on all OSes.
--Remove some unused functions.

Source/Ember/RendererBase.h

@@ -105,7 +105,7 @@ public:
 	size_t HistMemoryRequired(size_t strips);
 	pair<size_t, size_t> MemoryRequired(size_t strips, bool includeFinal, bool threadedWrite);
 	vector<QTIsaac<ISAAC_SIZE, ISAAC_INT>> RandVec();
-	bool PrepFinalAccumVector(vector<byte>& pixels);
+	bool PrepFinalAccumVector(vector<v4F>& pixels);
 
 	//Virtual processing functions.
 	virtual bool Ok() const;
@@ -121,7 +121,7 @@ public:
 	virtual void ComputeBounds() = 0;
 	virtual void ComputeQuality() = 0;
 	virtual void ComputeCamera() = 0;
-	virtual eRenderStatus Run(vector<byte>& finalImage, double time = 0, size_t subBatchCountOverride = 0, bool forceOutput = false, size_t finalOffset = 0) = 0;
+	virtual eRenderStatus Run(vector<v4F>& finalImage, double time = 0, size_t subBatchCountOverride = 0, bool forceOutput = false, size_t finalOffset = 0) = 0;
 	virtual EmberImageComments ImageComments(const EmberStats& stats, size_t printEditDepth = 0, bool hexPalette = true) = 0;
 	virtual DensityFilterBase* GetDensityFilter() = 0;
 
@@ -152,12 +152,9 @@ public:
 	void InsertPalette(bool insertPalette);
 	bool ReclaimOnResize() const;
 	void ReclaimOnResize(bool reclaimOnResize);
-	bool Transparency() const;
-	void Transparency(bool transparency);
 	void Callback(RenderCallback* callback);
 	void ThreadCount(size_t threads, const char* seedString = nullptr);
 	size_t BytesPerChannel() const;
-	void BytesPerChannel(size_t bytesPerChannel);
 	size_t NumChannels() const;
 	eThreadPriority Priority() const;
 	void Priority(eThreadPriority priority);
@@ -165,7 +162,6 @@ public:
 	void InteractiveFilter(eInteractiveFilter filter);
 
 	//Virtual render properties, getters and setters.
-	virtual void NumChannels(size_t numChannels);
 	virtual size_t ThreadCount()   const;
 	virtual eRendererType RendererType() const;
 
@@ -200,7 +196,6 @@ public:
 protected:
 	bool m_EarlyClip = false;
 	bool m_YAxisUp = false;
-	bool m_Transparency = false;
 	bool m_LockAccum = false;
 	bool m_InRender = false;
 	bool m_InFinalAccum = false;
@@ -213,8 +208,8 @@ protected:
 	size_t m_SuperSize = 0;
 	size_t m_GutterWidth;
 	size_t m_DensityFilterOffset;
-	size_t m_NumChannels = 3;
-	size_t m_BytesPerChannel = 1;
+	size_t m_NumChannels = 4;
+	size_t m_BytesPerChannel = 4;
 	size_t m_ThreadsToUse;
 	size_t m_VibGamCount;
 	size_t m_LastTemporalSample = 0;