Added "Replace color" image effect

ShareX.HelpersLib/Helpers/ImageHelpers.cs

@@ -2325,6 +2325,30 @@ public static void SelectiveColor(Bitmap bmp, Color lightColor, Color darkColor,
             }
         }
 
+        public static void ReplaceColor(Bitmap bmp, Color sourceColor, Color targetColor, bool autoSourceColor = false)
+        {
+            ColorBgra sourceBgra = new ColorBgra(sourceColor);
+            ColorBgra targetBgra = new ColorBgra(targetColor);
+
+            using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bmp, true))
+            {
+                if (autoSourceColor)
+                {
+                    sourceBgra = unsafeBitmap.GetPixel(0);
+                }
+
+                for (int i = 0; i < unsafeBitmap.PixelCount; i++)
+                {
+                    ColorBgra color = unsafeBitmap.GetPixel(i);
+
+                    if (color == sourceBgra)
+                    {
+                        unsafeBitmap.SetPixel(i, targetBgra);
+                    }
+                }
+            }
+        }
+
         public static Size GetImageFileDimensions(string filePath)
         {
             using (Bitmap bmp = LoadImage(filePath))

ShareX.ImageEffectsLib/Adjustments/ReplaceColor.cs

@@ -0,0 +1,56 @@
+#region License Information (GPL v3)
+
+/*
+    ShareX - A program that allows you to take screenshots and share any file type
+    Copyright (c) 2007-2021 ShareX Team
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
+*/
+
+#endregion License Information (GPL v3)
+
+using ShareX.HelpersLib;
+using System.ComponentModel;
+using System.Drawing;
+using System.Drawing.Design;
+
+namespace ShareX.ImageEffectsLib
+{
+    [Description("Replace color")]
+    internal class ReplaceColor : ImageEffect
+    {
+        [DefaultValue(typeof(Color), "White"), Editor(typeof(MyColorEditor), typeof(UITypeEditor)), TypeConverter(typeof(MyColorConverter))]
+        public Color SourceColor { get; set; }
+
+        [DefaultValue(false)]
+        public bool AutoSourceColor { get; set; }
+
+        [DefaultValue(typeof(Color), "Transparent"), Editor(typeof(MyColorEditor), typeof(UITypeEditor)), TypeConverter(typeof(MyColorConverter))]
+        public Color TargetColor { get; set; }
+
+        public ReplaceColor()
+        {
+            this.ApplyDefaultPropertyValues();
+        }
+
+        public override Bitmap Apply(Bitmap bmp)
+        {
+            ImageHelpers.ReplaceColor(bmp, SourceColor, TargetColor, AutoSourceColor);
+            return bmp;
+        }
+    }
+}

ShareX.ImageEffectsLib/Forms/ImageEffectsForm.cs

@@ -180,6 +180,7 @@ private void AddAllEffectsToContextMenu()
                 typeof(Hue),
                 typeof(Inverse),
                 typeof(Polaroid),
+                typeof(ReplaceColor),
                 typeof(Saturation),
                 typeof(SelectiveColor),
                 typeof(Sepia));

ShareX.ImageEffectsLib/ShareX.ImageEffectsLib.csproj

@@ -105,6 +105,7 @@
     <Compile Include="Adjustments\Alpha.cs" />
     <Compile Include="Adjustments\BlackWhite.cs" />
     <Compile Include="Adjustments\Polaroid.cs" />
+    <Compile Include="Adjustments\ReplaceColor.cs" />
     <Compile Include="Adjustments\SelectiveColor.cs" />
     <Compile Include="Adjustments\Sepia.cs" />
     <Compile Include="Adjustments\MatrixColor.cs" />