SKImage加载黄色PNG图像却渲染为蓝色的技术求助

绘制PNG图像时，图像呈现蓝色色调。

已更新，包含canvas的创建方式

SKImageInfo info = new SKImageInfo(2000, 2000);
SKBitmap bitmap = new SKBitmap(info);
Texture texture = new Texture((uint)bitmap.Width, (uint)bitmap.Height);
Sprite sprite = new Sprite(texture);
var surface = SKSurface.Create(bitmap.Info, bitmap.GetPixels(), bitmap.RowBytes);
var canvas = surface.Canvas;

var X = 0;
var Y = 0;
var paint = new SKPaint {
    IsAntialias = true,
    Color = SKColors.White,
    BlendMode = SKBlendMode.SrcOver,
    IsDither = true,
    ColorFilter = SKColorFilter.CreateBlendMode(SKColors.White, SKBlendMode.Modulate)
};
var cursorImage = SKImage.FromEncodedData("my_yellow_file.png");
var cursorPositionSrc = new SKRect(0, 0, cursorImage.Width, cursorImage.Height);
var cursorPositionDest = new SKRect(
    X,
    Y - (cursorImage.Height / 2),
    X + cursorImage.Width,
    Y + (cursorImage.Height / 2)
);
// canvas is a large surface to draw on
canvas.DrawImage(this.cursorImage, cursorPositionSrc, this.cursorPositionDest, this.cursorPaint);

• 原始图像：原本为黄色的PNG文件
• 图像元数据：无外链展示

• 结果图像：原本黄色的图像渲染后呈现明显蓝色色调

• 操作系统：Win11

针对图像偏蓝的问题，可尝试以下修复步骤：

1. 移除冗余的颜色滤镜 #

当前SKPaint中的ColorFilter设置为白色与Modulate模式，虽理论上不改变颜色，但可能因图像Alpha通道或颜色空间差异引发异常。直接移除该滤镜：

var paint = new SKPaint {
    IsAntialias = true,
    Color = SKColors.White,
    BlendMode = SKBlendMode.SrcOver,
    IsDither = true
};

2. 显式指定图像信息的颜色格式 #

默认SKImageInfo的颜色类型可能与图像不匹配，显式设置为RGBA8888预乘Alpha格式，确保颜色通道解析正确：

SKImageInfo info = new SKImageInfo(2000, 2000, SKColorType.Rgba8888, SKAlphaType.Premul);

3. 修正Paint引用错误 #

代码中定义了paint变量，但绘制时使用this.cursorPaint，若cursorPaint存在错误配置会导致色调异常，需确保引用正确：

canvas.DrawImage(cursorImage, cursorPositionSrc, cursorPositionDest, paint);

4. 转换图像颜色格式（可选） #

若原始图像颜色通道顺序为BGR，加载后转换为SkiaSharp默认的RGBA格式：

using var cursorImage = SKImage.FromEncodedData("my_yellow_file.png");
using var convertedImage = cursorImage.ToImage(SKColorType.Rgba8888, SKAlphaType.Premul);
// 使用convertedImage进行绘制
canvas.DrawImage(convertedImage, cursorPositionSrc, cursorPositionDest, paint);

内容的提问来源于stack exchange，提问作者X3R0