Этап 9

Minint.Core/Services/IImageEffectsService.cs

@@ -0,0 +1,18 @@
+using Minint.Core.Models;
+
+namespace Minint.Core.Services;
+
+public interface IImageEffectsService
+{
+    /// <summary>
+    /// Adjusts contrast of the document by transforming its palette colors.
+    /// <paramref name="factor"/> of 0 = all gray, 1 = no change, >1 = increased contrast.
+    /// </summary>
+    void ApplyContrast(MinintDocument doc, double factor);
+
+    /// <summary>
+    /// Converts the document to grayscale by transforming its palette colors
+    /// using the luminance formula: 0.299R + 0.587G + 0.114B.
+    /// </summary>
+    void ApplyGrayscale(MinintDocument doc);
+}