blocks|key|1236575|text|获取图像的图形对象，将当前绘制设置为所需的颜色，然后调用fillRect(0,0,width,height)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1236576|BufferedImage+b_img+=+...
Graphics2D++++graphics+=+b_img.createGraphics();

graphics.setPaint+(+new+Color+(+r,+g,+b+)+);
graphics.fillRect+(+0,+0,+b_img.getWidth(),+b_img.getHeight()+);|code-block|syntax|javascript|1236577|entityMap^0|S|Q|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Get the graphics object for the image, set the current paint to the desired colour, then call <code>fillRect(0,0,width,height)</code>. 

<pre><code>BufferedImage b_img = ...
Graphics2D graphics = b_img.createGraphics();

graphics.setPaint ( new Color ( r, g, b ) );
graphics.fillRect ( 0, 0, b_img.getWidth(), b_img.getHeight() );
</code></pre>

blocks|key|1451365|text|可能是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1451366|BufferedImage+image+=+new+BufferedImage(...);
Graphics2D+g2d+=+image.createGraphics();
g2d.setColor(...);
g2d.fillRect(...);|code-block|syntax|javascript|1451367|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Probably something like:

<pre><code>BufferedImage image = new BufferedImage(...);
Graphics2D g2d = image.createGraphics();
g2d.setColor(...);
g2d.fillRect(...);
</code></pre>

blocks|key|1236605|text|使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1236606|BufferedImage+bi+=+new+BufferedImage(width,+height,
++++++++++++++++BufferedImage.TYPE_INT_ARGB);
Graphics2D+ig2+=+bi.createGraphics();

ig2.setBackground(Color.WHITE);
ig2.clearRect(0,+0,+width,+height);|code-block|syntax|javascript|1236607|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use this:

<pre><code>BufferedImage bi = new BufferedImage(width, height,
 BufferedImage.TYPE_INT_ARGB);
Graphics2D ig2 = bi.createGraphics();

ig2.setBackground(Color.WHITE);
ig2.clearRect(0, 0, width, height);
</code></pre>

blocks|key|1236620|text|BufferedImage+image+=+new+BufferedImage(width,height,+BufferedImage.TYPE_INT_ARGB);
int[]data=((DataBufferInt)+image.getRaster().getDataBuffer()).getData();
Arrays.fill(data,color.getRGB());|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1236621|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>BufferedImage image = new BufferedImage(width,height, BufferedImage.TYPE_INT_ARGB);
int[]data=((DataBufferInt) image.getRaster().getDataBuffer()).getData();
Arrays.fill(data,color.getRGB());
</code></pre>

blocks|key|1236662|text|对于那些想要将创建的图像保存到文件中的人，我使用了前面的答案，并添加了文件保存部分：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1236663|import+java.awt.Color;
import+java.awt.Graphics2D;
import+java.awt.color.ColorSpace;
import+java.awt.image.BufferedImage;
import+javax.imageio.ImageIO;

//+Create+the+image
BufferedImage+bi+=+new+BufferedImage(80,+40,+ColorSpace.TYPE_RGB);
Graphics2D+graphics+=+bi.createGraphics();

//+Fill+the+background+with+gray+color
Color+rgb+=+new+Color(50,+50,+50);
graphics.setColor+(rgb);
graphics.fillRect+(+0,+0,+bi.getWidth(),+bi.getHeight());

//+Save+the+file+in+PNG+format
File+outFile+=+new+File("output.png");
ImageIO.write(bi,+"png",+outFile);|code-block|syntax|javascript|1236664|您也可以将图像保存为其他格式，如bmp、jpg等。|1236665|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For who want also to save the created image to a file, I have used previous answers and added the file saving part:

<pre><code>import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;

// Create the image
BufferedImage bi = new BufferedImage(80, 40, ColorSpace.TYPE_RGB);
Graphics2D graphics = bi.createGraphics();

// Fill the background with gray color
Color rgb = new Color(50, 50, 50);
graphics.setColor (rgb);
graphics.fillRect ( 0, 0, bi.getWidth(), bi.getHeight());

// Save the file in PNG format
File outFile = new File("output.png");
ImageIO.write(bi, "png", outFile);
</code></pre>

You can also save the image in other formats like bmp, jpg, etc...

I need to create a rectangular <code>BufferedImage</code> with a specified background color, draw some pattern on the background and save it to file. I don't know how to create the background.

I am using a nested loop:

<pre><code>BufferedImage b_img = ...
for every row
for every column
setRGB(r,g,b);
</code></pre>

But it's very slow when the image is large.

How to set the color in a more efficient way?

Set BufferedImage to be a color in Java

我需要创建一个具有指定背景颜色的矩形BufferedImage，在背景上绘制一些图案并将其保存到文件中。我不知道如何创建背景。我使用的是嵌套循环：BufferedImage b_img = ...for every rowfor every columnsetRGB(r,g,b);但当图像很大时，它会非常慢。如何以更有...

问在Java中将BufferedImage设置为颜色
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