問題描述

我一直在編寫 PCX 解碼器，到目前為止，PCX 圖像本身解析得很好，但我不知道如何設置位圖的調色板.

I have been writing a PCX decoder and, so far, the PCX image itself parses fine, but I can't work out how to set the palette of a bitmap.

我已經創建了一個像這樣的位圖:

I have created a bitmap like so:

Bitmap bmp = new Bitmap(width,
                        height,
                        stride2,
                        System.Drawing.Imaging.PixelFormat.Format8bppIndexed,
                        pixels);

但我似乎無法使用以下方法設置調色板:

But I can't seem to set the palette using the following method:

for (int i = 0; i < 256; i += 3)
{
    Color b = new Color();
    b = Color.FromArgb(palette[i], palette[i + 1], palette[i + 2]);
    bmp.Palette.Entries.SetValue(b, i);
}

在這個例子中，我已經閱讀了 pcx 文件調色板中的每個字節并將它們存儲在調色板 [] 中.從那里，我用它來設置位圖調色板中的條目.如何設置顏色?

In this example, I have read through each byte in the palette of the pcx file and stored them in palette[]. from there, I have used this to set the entries in the palette of the bitmap. How do I set the colours?

推薦答案

這也讓我感到困惑.似乎 bitmap.Palette 返回位圖調色板的克隆.一旦你修改了你的副本，你需要使用 bitmap.Palette = Palette 重置位圖的調色板，例如

This had me confused too. It seems bitmap.Palette returns a clone of the bitmap's palette. Once you've modified your copy, you need to reset the bitmap's pallete by using bitmap.Palette = palette, e.g.

ColorPalette palette = bitmap.Palette;
Color entries = palette.Entries;
....
entries[i] = new Color(...);
....
bitmap.Palette = palette; // The crucial statement

參見 http://www.charlespetzold.com/pwcs/PaletteChange.html

這篇關于無法在位圖中設置調色板的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！