FIX: White level would become invalid when using 16-bit output option. (

#57)

burstphoto/denoise.swift

@@ -228,9 +228,10 @@ func perform_denoising(image_urls: [URL], progress: ProcessingProgress, merging_
     // apply scaling to 16 bit
     let scale_to_16bit = (output_bit_depth=="16Bit" && mosaic_pattern_width == 2 && exposure_control != "Off")
     let factor_16bit = (scale_to_16bit ? Int(pow(2.0, 16.0-ceil(log2(Double(white_level[ref_idx]))))+0.5) : 1)
+    let white_level_scaled = min(65535, factor_16bit*white_level[ref_idx])
 
     // convert final image to 16 bit integer
-    let output_texture_uint16 = convert_float_to_uint16(final_texture, (white_level[ref_idx] == -1 ? 1000000 : factor_16bit*white_level[ref_idx]), black_level[ref_idx], factor_16bit, mosaic_pattern_width)
+    let output_texture_uint16 = convert_float_to_uint16(final_texture, (white_level[ref_idx] == -1 ? 1000000 : white_level_scaled), black_level[ref_idx], factor_16bit, mosaic_pattern_width)
 
     print("Time to align+merge all images: ", Float(DispatchTime.now().uptimeNanoseconds - t) / 1_000_000_000)
     t = DispatchTime.now().uptimeNanoseconds
@@ -264,7 +265,7 @@ func perform_denoising(image_urls: [URL], progress: ProcessingProgress, merging_
     }
 
     // save the output image
-    try texture_to_dng(output_texture_uint16, ref_dng_url, out_url, (scale_to_16bit ? Int32(factor_16bit*white_level[ref_idx]) : -1))
+    try texture_to_dng(output_texture_uint16, ref_dng_url, out_url, (scale_to_16bit ? Int32(white_level_scaled) : -1))
 
     // check if dng converter is installed
     if dng_converter_present {