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我正在创建一个需要将图像复制到剪贴板的程序。问题是图像具有透明背景，并且每当我复制它时，图像的背景都是黑色而不是透明。自 2 天前以来，我尝试了很多东西，但都没有奏效。imageSelection 类基于http://www.java2s.com/Tutorial/Java/0120__Development/SettinganimageontheclipboardwithacustomTransferableobjecttoholdtheimage.htm

package Package1;

import java.awt.Image;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

/** Transferable image */
public class imageSelection implements Transferable {
    private Image image;

    /** Creates a "transferable image" */
    public imageSelection(Image image) {
        this.image = image;
    }


    public DataFlavor[] getTransferDataFlavors() {
        DataFlavor[] transferData = new DataFlavor[] { DataFlavor.imageFlavor }; // <--- Works but gives me a black background instead of transparent

        /* I tried this (based on https://stackoverflow.com/questions/15977001/clipboard-copy-from-outlook-always-has-black-background-set-when-retrieved-as-im) but wasn't able to achieve any good result with it.

        DataFlavor transferData = null;
        try {
            transferData = new DataFlavor(Image.class, null); // <---- How to get an object of the type DataFlavor[] from this ( DataFlavor("image/x-emf") is of the type DataFlavor, not DataFlavor[] )
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            error.displayError(e.getStackTrace(), "Error creating DataFlavor (mime type: image/x-emf)");
        } 

        return new DataFlavor[] { transferData }
        */

        return transferData;
    }

    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return DataFlavor.imageFlavor.equals(flavor);
    }


    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        if (!DataFlavor.imageFlavor.equals(flavor)) {
            throw new UnsupportedFlavorException(flavor);
        }
        return image;
    }
}

称呼：

imageSelection imgSel = new imageSelection(new ImageIcon(emojiLocation).getImage());
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(imgSel, null);

谢谢

我正在通过将内容粘贴到 Discord 中来测试内容（聊天应用程序，它确实支持透明度，我确信这一点）。我正在使用 jdk1.8.0_131。我正在使用完全更新的 Windows 10 64 位。如果需要，完整的源代码在这里：https ://github.com/KingOffNothing/EmojiMenu-for-discord/tree/master/src/Package1 程序所做的是将剪贴板更改为选定的图像，然后是用 AHK 编写的程序将模拟粘贴图像的按键 ctrl+v。

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1 回答 1

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我无法完全解决透明度问题，但能够解决问题（更改透明像素以匹配背景颜色）

private static BufferedImage fixTransparency(BufferedImage image) {
        int width = image.getWidth();
        int height = image.getHeight();
        Color discordChatColor = new Color(54,57,62, 255);

        for (int xx = 0; xx < width; xx++) {
            for (int yy = 0; yy < height; yy++) {
                Color originalColor = new Color(image.getRGB(xx, yy), true);
                if (originalColor.getAlpha() == 0) {
                    image.setRGB(xx, yy, discordChatColor.getRGB());
                }
            }
        }
        return image;
    }
于 2017-06-10T18:31:02.710 回答