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Joined: 7/30/2017(UTC)
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Hi, I am trying to apply a tint to a bitmap that has been processed through the GreenRemoval object but am being unsuccessful at it and was wondering if anyone could help me with it. What I have so far is that I pass in a cv image into my method and then create a bitmap object from that. This image is the one with the green screen background. I then process that image via the GreenRemoval object. Next I try to apply a tint to the image and finally I draw that image onto a background image. If I do not apply the tint the image turns out perfect with the GreenRemoval process but when I try to apply the tint I only get the original image with the green removed with the tint applied but the background image is not present. I think what is happening is that I am losing the transparency when I apply the tint. Is there a way to apply the tint and keep the transparency so that when I draw that on top of the background image the background image is as intended and only the processed image has a tint on it? I have posted the code that I have so far: Code:
private void ProcessGreenScreen(string filename, cv.Image<Bgr, byte> img)
{
try
{
// Do we have a valid green screen background?
if (Globals.AppliedBackground != null)
{
// If so get a bitmap object from the cv image.
using (Aurigma.GraphicsMill.Bitmap bmp = new Aurigma.GraphicsMill.Bitmap(img.Bitmap))
{
// Create a new greenscreen removal object.
using (var GreenRemove = new GreenScreenRemoval())
{
// Remove the green background from the image.
Aurigma.GraphicsMill.Bitmap bitmapNoGreen = GreenRemove.Apply((bmp));
// Do we need to apply a tint to the image?
if (Globals.FiltersEnabled && Globals.AppliedFilter != null && Globals.AppliedFilter.NoFilter == false)
{
// If so, send it to the method that applies the tint.
_cameraBase.TintedFilter(new RgbColor(Globals.AppliedFilter.Red, Globals.AppliedFilter.Green, Globals.AppliedFilter.Blue), ref bitmapNoGreen);
}
// Get the green screen background image filename.
string backgroundImage = Globals.GreenscreenFolder + "\\" + Globals.AppliedBackground.Filename;
// Create a bitmap object from the file.
using (var bckgrnd = new Aurigma.GraphicsMill.Bitmap(backgroundImage))
{
// Does the green screen background image need to be resized?
if (Globals.AppliedBackground.IsValidDimensions == false)
{
// If so, resize it now.
bckgrnd.Transforms.Resize(new Size((int)Globals.CameraDefaultWidth, (int)Globals.CameraDefaultHeight), ResizeInterpolationMode.Lanczos3, ResizeMode.ImageFill);
}
// Draw the image onto the background image.
bckgrnd.Draw(bitmapNoGreen, 0, 0, CombineMode.Alpha);
// Change the DPI of the image.
bckgrnd.DpiX = Globals.PrintDPI;
bckgrnd.DpiY = Globals.PrintDPI;
// Save the image as a jpg
var jpegSettings = new Aurigma.GraphicsMill.Codecs.JpegSettings();
jpegSettings.Quality = 90;
jpegSettings.UseSubsampling = false;
jpegSettings.IsProgressive = true;
bckgrnd.Save(filename, jpegSettings);
}
}
}
}
else
{
log.Debug("Green Screen Background not loaded");
}
}
catch (Exception e)
{
log.Debug(e);
}
}
And the code that actually applies the tint is as follows: Code:
public void TintedFilter(RgbColor color, ref Aurigma.GraphicsMill.Bitmap bmp)
{
if (bmp.ColorProfile == null)
{
bmp.ColorProfile = ColorProfile.FromSrgb();
}
var labColor = RgbToLabColor(color);
var a = labColor.A;
var b = labColor.B;
using (var lChannel = new Aurigma.GraphicsMill.Bitmap())
{
// Convert to Lab color space and get lightness channel
using (var labConverter = new Aurigma.GraphicsMill.Transforms.ColorConverter(Aurigma.GraphicsMill.PixelFormat.Format24bppLab))
using (var splitter = new LabChannelSplitter())
{
splitter.L = lChannel;
Pipeline.Run(bmp + labConverter + splitter);
}
// Create a and b channels, combine with lightness channel and convert to RGB color space
using (var combiner = new LabChannelCombiner())
using (var aChannel = new Aurigma.GraphicsMill.Bitmap(lChannel.Width, lChannel.Height, Aurigma.GraphicsMill.PixelFormat.Format8bppGrayscale, new GrayscaleColor((byte)(a + 127))))
using (var bChannel = new Aurigma.GraphicsMill.Bitmap(lChannel.Width, lChannel.Height, Aurigma.GraphicsMill.PixelFormat.Format8bppGrayscale, new GrayscaleColor((byte)(b + 127))))
using (var rgbConverter = new Aurigma.GraphicsMill.Transforms.ColorConverter(Aurigma.GraphicsMill.PixelFormat.Format24bppRgb))
{
combiner.L = lChannel;
combiner.A = aChannel;
combiner.B = bChannel;
rgbConverter.DestinationProfile = ColorProfile.FromSrgb();
Pipeline.Run(combiner + rgbConverter + bmp);
}
}
}
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Rank: Advanced Member
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Joined: 7/4/2017(UTC)
Posts: 43
Was thanked: 12 time(s) in 12 post(s)
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Hi Lauren, Just save original alpha channel in the beginning of TintedFilter() function and then add it to the bitmap after applying the tint: Code:public static void TintedFilter(RgbColor color, ref Aurigma.GraphicsMill.Bitmap bmp)
{
var transparencyChannel = bmp.Channels[Channel.Alpha];
// ... Existing code ...
using (var combiner = new RgbChannelCombiner())
{
combiner.R = bmp.Channels[Channel.Red];
combiner.G = bmp.Channels[Channel.Green];
combiner.B = bmp.Channels[Channel.Blue];
combiner.A = transparencyChannel;
Pipeline.Run(combiner + bmp);
}
}
Regards, Andrew Edited by user Tuesday, November 21, 2017 3:23:13 AM(UTC)
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 1 user thanked Andrey Semenov for this useful post.
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