在编程时去除图片白边的方法取决于你使用的编程语言和平台。以下是针对不同语言和平台的一些建议:
C
在C中,可以使用`System.Drawing`命名空间中的类来裁剪图片,去除白边。以下是一个示例代码:
```csharp
using System.Drawing;
public static Bitmap CutImageWhitePart(string FilePath)
{
Bitmap bmp = new Bitmap(FilePath);
int top = 0, left = 0, right = bmp.Width, bottom = bmp.Height;
// 寻找最上面的标线
for (int i = 0; i < bmp.Height; i++)
{
bool find = false;
for (int j = 0; j < bmp.Width; j++)
{
Color c = bmp.GetPixel(j, i);
if (!IsWhite(c))
{
top = i;
find = true;
break;
}
}
if (find) break;
}
// 寻找最左边的标线
for (int i = 0; i < bmp.Width; i++)
{
bool find = false;
for (int j = top; j < bmp.Height; j++)
{
Color c = bmp.GetPixel(i, j);
if (!IsWhite(c))
{
left = i;
find = true;
break;
}
}
if (find) break;
}
// 裁剪图片
return bmp.Crop(new Rectangle(left, top, bmp.Width - left, bmp.Height - top));
}
private static bool IsWhite(Color c)
{
return c.R == 255 && c.G == 255 && c.B == 255;
}
```
C语言
在C语言中,可以使用GDI/GDI+ API来处理图片。以下是一个简单的示例代码:
```c
include include include include pragma comment (lib, "gdiplus.lib") int main() { ULONG_PTR token; GdiplusStartupInput input; GdiplusStartup(&token, &input, NULL); Gdiplus::Bitmap *image = new Gdiplus::Bitmap("shiyan.png"); Gdiplus::Graphics graphics(image); Gdiplus::RectF rect(0, 0, image->GetWidth(), image->GetHeight()); graphics.DrawImage(image, rect); Gdiplus::Bitmap *resizedImage = new Gdiplus::Bitmap(image->GetWidth(), image->GetHeight()); graphics.DrawImage(image, resizedImage->GetBounds()); Gdiplus::FileStream file("resized_image.png", FileMode::Create); resizedImage->Save(file, &Gdiplus::ImageFormatPNG); delete image; delete resizedImage; GdiplusShutdown(token); return 0; } ``` Python 在Python中,可以使用`matplotlib`库来去除图片白边。以下是一个示例代码: ```python import matplotlib.pyplot as plt def remove_white_border(image_path, output_path, dpi=300): fig, ax = plt.subplots() im = plt.imread(image_path) ax.imshow(im, aspect='equal') plt.axis('off') height, width, channels = im.shape fig.set_size_inches(width / 100.0 / 3.0, height / 100.0 / 3.0) plt.savefig(output_path, dpi=dpi, bbox_inches='tight', pad_inches=0) remove_white_border('input_image.png', 'output_image.png') ``` HTML/CSS 在HTML/CSS中,可以通过设置图片的`vertical-align`属性或调整背景图片的高度来去除白边。以下是一个示例代码: