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/Fractorium/FractoriumMenus.cpp

@@ -349,9 +349,10 @@ void Fractorium::OnActionSaveCurrentScreen(bool checked)
 	auto filename = SetupSaveImageDialog(m_Controller->Name());
 	auto renderer = m_Controller->Renderer();
 	auto& pixels = *m_Controller->FinalImage();
-	auto rendererCL = dynamic_cast<RendererCLBase*>(m_Controller->Renderer());
+	auto rendererCL = dynamic_cast<RendererCLBase*>(renderer);
 	auto stats = m_Controller->Stats();
 	auto comments = renderer->ImageComments(stats, 0, true);
+	auto settings = FractoriumSettings::Instance();
 
 	if (rendererCL && renderer->PrepFinalAccumVector(pixels))
 	{
@@ -362,7 +363,7 @@ void Fractorium::OnActionSaveCurrentScreen(bool checked)
 		}
 	}
 
-	m_Controller->SaveCurrentRender(filename, comments, pixels, renderer->FinalRasW(), renderer->FinalRasH(), renderer->NumChannels(), renderer->BytesPerChannel());
+	m_Controller->SaveCurrentRender(filename, comments, pixels, renderer->FinalRasW(), renderer->FinalRasH(), settings->Png16Bit(), settings->Transparency());
 }
 
 /// <summary>
@@ -879,7 +880,7 @@ void Fractorium::OnActionFinalRender(bool checked)
 void Fractorium::OnFinalRenderClose(int result)
 {
 	m_RenderStatusLabel->setText("Renderer starting...");
-	StartRenderTimer();//Re-create the renderer and start rendering again.
+	StartRenderTimer(false);//Re-create the renderer and start rendering again.
 	ui.ActionStartStopRenderer->setChecked(false);//Re-enable any controls that might have been disabled.
 	OnActionStartStopRenderer(false);
 }
@@ -892,10 +893,17 @@ void Fractorium::OnFinalRenderClose(int result)
 /// <param name="checked">Ignored</param>
 void Fractorium::OnActionOptions(bool checked)
 {
+	bool ec = m_Settings->EarlyClip();
+	bool yup = m_Settings->YAxisUp();
+	bool trans = m_Settings->Transparency();
+
 	if (m_OptionsDialog->exec())
 	{
+		bool updatePreviews = ec != m_Settings->EarlyClip() ||
+							  yup != m_Settings->YAxisUp() ||
+							  trans != m_Settings->Transparency();
 		SyncOptionsToToolbar();//This won't trigger a recreate, the call below handles it.
-		ShutdownAndRecreateFromOptions();//This will recreate the controller and/or the renderer from the options if necessary, then start the render timer.
+		ShutdownAndRecreateFromOptions(updatePreviews);//This will recreate the controller and/or the renderer from the options if necessary, then start the render timer.
 	}
 }