如何在Java中减小图像大小

Question

Please help some one for how to reduce the size of image in java

my problem is

i am taking one image as input for java program and taking output as .bmp image

for creating new image i am using the following code

for (int i = 0; i < width; i++)     
         {    
              for (int j = 0; j < height; j++)   
              {  
                Color c = new Color(color2[i][j], color2[i][j], color2[i][j]);  
                image1.setRGB(i, j, c.getRGB());   
              }     
          }   
ImageIO.write(image1, "bmp", new File("hh5_binary_Adjust.bmp"));

but if i use the above code i am getting 6.5 mb size for one A4 size paper so please help me to get a minimum length of image without modifying the file extension that is bmp

Answer 1

If you want to reduce the resolution, there isn't a good way to do this and get a really crisp output image without using an external library. I recommend imgscalr . I've had fantastic results with it.

But please be aware that the main reason you have a large file size is that you're using BMP as the output format! If you change that, you'll massively reduce the file size easily and cheaply. I'd go with JPG for photos, or PNG for graphics.

The ImageIO class will save to either of those with no trouble.