IECoreImageTest : Adapt for GafferHQ/dependencies 8.0.1

This changes error messages and precision subtly, for reasons I don't want to spend the time ascertaining right now.

Author: johnhaddon

test/IECoreImage/ImageReaderTest.py

@@ -212,7 +212,7 @@ def testOrientation( self ) :
 	def testIncompleteImage( self ) :
 
 		r = IECoreImage.ImageReader( os.path.join( "test", "IECoreImage", "data", "exr", "incomplete.exr" ) )
-		self.assertRaisesRegex( Exception, "Error reading pixel data from image file", r.read )
+		self.assertRaisesRegex( Exception, "Error reading pixel data from image file|.*Some scanline chunks were missing or corrupted", r.read )
 
 	def testHeaderToBlindData( self ) :
 

test/IECoreImage/ImageThinnerTest.py

@@ -58,7 +58,7 @@ def test( self ) :
 			iic = ii[c]
 			for j in range( 0, i.channelSize() ) :
 				# the values may not match exactly due to color space conversions reading the tif on disk
-				self.assertAlmostEqual( ic[j], iic[j], 6 )
+				self.assertAlmostEqual( ic[j], iic[j], delta = 0.0001 )
 
 if __name__ == "__main__":
 	unittest.main()