C# 将透明PNG保存为透明GIF
我正在尝试调整透明png的大小,并将其保存为单帧gif图像。 让我们跳过调整大小部分,当您尝试将透明png保存为gif时,您将在输出gif中看到黑色背景:C# 将透明PNG保存为透明GIF,c#,image,C#,Image,我正在尝试调整透明png的大小,并将其保存为单帧gif图像。 让我们跳过调整大小部分,当您尝试将透明png保存为gif时,您将在输出gif中看到黑色背景: Bitmap n = new Bitmap(targetPngPath); n.Save(@"C:\1.gif", ImageFormat.Gif); 是的,我可以把黑色背景变成白色,但这不是我想要的。即使我可以使用MakeTransparent方法删除黑色,但它将删除图像中的几乎所有黑色,并且我们将没有标准的透明图像 我们还可以保存gif
Bitmap n = new Bitmap(targetPngPath);
n.Save(@"C:\1.gif", ImageFormat.Gif);
是的,我可以把黑色背景变成白色,但这不是我想要的。即使我可以使用MakeTransparent
方法删除黑色,但它将删除图像中的几乎所有黑色,并且我们将没有标准的透明图像
我们还可以保存gif图像,我们在文件名中保留扩展名,但我们会将其保存为PNG格式,如下所示:
n.Save(@"C:\1.gif", ImageFormat.Png);
但这也不是标准。
那么,有没有办法安全地将一个透明的png保存为一个透明的gif图像呢
巴布亚新几内亚=
GIF=
使用Photoshop保存GIF=这是因为内置GIF编码器无法很好地处理源文件,除非它已经是一个8 bpp的图像。您必须先将PNG图像转换为256色图像,然后才能使用GIF编码器正确保存
public static void SaveGif(string fileName, Image image)
{
int bpp = Image.GetPixelFormatSize(image.PixelFormat);
if (bpp == 8)
{
image.Save(fileName, ImageFormat.Gif);
return;
}
// 1 and 4 bpp images are need to be converted, too; otherwise, gif encoder encodes the image from 32 bpp image resulting 256 color, no transparency
if (bpp < 8)
{
using (Image image8Bpp = ConvertPixelFormat(image, PixelFormat.Format8bppIndexed, null))
{
image8Bpp.Save(fileName, ImageFormat.Gif);
return;
}
}
// high/true color bitmap: obtaining the colors
// Converting always to 8 bpp pixel format; otherwise, gif encoder would convert it to 32 bpp first.
// With 8 bpp, gif encoder will preserve transparency and will save compact palette
// Note: This works well for 256 color images in a 32bpp bitmap. Otherwise, you might try to pass null as palette so a default palette will be used.
Color[] palette = GetColors((Bitmap)image, 256);
using (Image imageIndexed = ConvertPixelFormat(image, PixelFormat.Format8bppIndexed, palette))
{
imageIndexed.Save(fileName, ImageFormat.Gif);
}
}
// TODO: Use some quantizer
private static Color[] GetColors(Bitmap bitmap, int maxColors)
{
if (bitmap == null)
throw new ArgumentNullException("bitmap");
if (maxColors < 0)
throw new ArgumentOutOfRangeException("maxColors");
HashSet<int> colors = new HashSet<int>();
PixelFormat pixelFormat = bitmap.PixelFormat;
if (Image.GetPixelFormatSize(pixelFormat) <= 8)
return bitmap.Palette.Entries;
// 32 bpp source: the performant variant
if (pixelFormat == PixelFormat.Format32bppRgb ||
pixelFormat == PixelFormat.Format32bppArgb ||
pixelFormat == PixelFormat.Format32bppPArgb)
{
BitmapData data = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size), ImageLockMode.ReadOnly, pixelFormat);
try
{
unsafe
{
byte* line = (byte*)data.Scan0;
for (int y = 0; y < data.Height; y++)
{
for (int x = 0; x < data.Width; x++)
{
int c = ((int*)line)[x];
// if alpha is 0, adding the transparent color
if ((c >> 24) == 0)
c = 0xFFFFFF;
if (colors.Contains(c))
continue;
colors.Add(c);
if (colors.Count == maxColors)
return colors.Select(Color.FromArgb).ToArray();
}
line += data.Stride;
}
}
}
finally
{
bitmap.UnlockBits(data);
}
}
else
{
// fallback: getpixel
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
int c = bitmap.GetPixel(x, y).ToArgb();
if (colors.Contains(c))
continue;
colors.Add(c);
if (colors.Count == maxColors)
return colors.Select(Color.FromArgb).ToArray();
}
}
}
return colors.Select(Color.FromArgb).ToArray();
}
private static Image ConvertPixelFormat(Image image, PixelFormat newPixelFormat, Color[] palette)
{
if (image == null)
throw new ArgumentNullException("image");
PixelFormat sourcePixelFormat = image.PixelFormat;
int bpp = Image.GetPixelFormatSize(newPixelFormat);
if (newPixelFormat == PixelFormat.Format16bppArgb1555 || newPixelFormat == PixelFormat.Format16bppGrayScale)
throw new NotSupportedException("This pixel format is not supported by GDI+");
Bitmap result;
// non-indexed target image (transparency preserved automatically)
if (bpp > 8)
{
result = new Bitmap(image.Width, image.Height, newPixelFormat);
using (Graphics g = Graphics.FromImage(result))
{
g.DrawImage(image, 0, 0, image.Width, image.Height);
}
return result;
}
int transparentIndex;
Bitmap bmp;
// indexed colors: using GDI+ natively
RGBQUAD[] targetPalette = new RGBQUAD[256];
int colorCount = InitPalette(targetPalette, bpp, (image is Bitmap) ? image.Palette : null, palette, out transparentIndex);
BITMAPINFO bmi = new BITMAPINFO();
bmi.icHeader.biSize = (uint)Marshal.SizeOf(typeof(BITMAPINFOHEADER));
bmi.icHeader.biWidth = image.Width;
bmi.icHeader.biHeight = image.Height;
bmi.icHeader.biPlanes = 1;
bmi.icHeader.biBitCount = (ushort)bpp;
bmi.icHeader.biCompression = BI_RGB;
bmi.icHeader.biSizeImage = (uint)(((image.Width + 7) & 0xFFFFFFF8) * image.Height / (8 / bpp));
bmi.icHeader.biXPelsPerMeter = 0;
bmi.icHeader.biYPelsPerMeter = 0;
bmi.icHeader.biClrUsed = (uint)colorCount;
bmi.icHeader.biClrImportant = (uint)colorCount;
bmi.icColors = targetPalette;
bmp = (image as Bitmap) ?? new Bitmap(image);
// Creating the indexed bitmap
IntPtr bits;
IntPtr hbmResult = CreateDIBSection(IntPtr.Zero, ref bmi, DIB_RGB_COLORS, out bits, IntPtr.Zero, 0);
// Obtaining screen DC
IntPtr dcScreen = GetDC(IntPtr.Zero);
// DC for the original hbitmap
IntPtr hbmSource = bmp.GetHbitmap();
IntPtr dcSource = CreateCompatibleDC(dcScreen);
SelectObject(dcSource, hbmSource);
// DC for the indexed hbitmap
IntPtr dcTarget = CreateCompatibleDC(dcScreen);
SelectObject(dcTarget, hbmResult);
// Copy content
BitBlt(dcTarget, 0, 0, image.Width, image.Height, dcSource, 0, 0, 0x00CC0020 /*TernaryRasterOperations.SRCCOPY*/);
// obtaining result
result = Image.FromHbitmap(hbmResult);
result.SetResolution(image.HorizontalResolution, image.VerticalResolution);
// cleanup
DeleteDC(dcSource);
DeleteDC(dcTarget);
ReleaseDC(IntPtr.Zero, dcScreen);
DeleteObject(hbmSource);
DeleteObject(hbmResult);
ColorPalette resultPalette = result.Palette;
bool resetPalette = false;
// restoring transparency
if (transparentIndex >= 0)
{
// updating palette if transparent color is not actually transparent
if (resultPalette.Entries[transparentIndex].A != 0)
{
resultPalette.Entries[transparentIndex] = Color.Transparent;
resetPalette = true;
}
ToIndexedTransparentByArgb(result, bmp, transparentIndex);
}
if (resetPalette)
result.Palette = resultPalette;
if (!ReferenceEquals(bmp, image))
bmp.Dispose();
return result;
}
private static int InitPalette(RGBQUAD[] targetPalette, int bpp, ColorPalette originalPalette, Color[] desiredPalette, out int transparentIndex)
{
int maxColors = 1 << bpp;
// using desired palette
Color[] sourcePalette = desiredPalette;
// or, using original palette if it has fewer or the same amount of colors as requested
if (sourcePalette == null && originalPalette != null && originalPalette.Entries.Length > 0 && originalPalette.Entries.Length <= maxColors)
sourcePalette = originalPalette.Entries;
// or, using default system palette
if (sourcePalette == null)
{
using (Bitmap bmpReference = new Bitmap(1, 1, GetPixelFormat(bpp)))
{
sourcePalette = bmpReference.Palette.Entries;
}
}
// it is ignored if source has too few colors (rest of the entries will be black)
transparentIndex = -1;
bool hasBlack = false;
int colorCount = Math.Min(maxColors, sourcePalette.Length);
for (int i = 0; i < colorCount; i++)
{
targetPalette[i] = new RGBQUAD(sourcePalette[i]);
if (transparentIndex == -1 && sourcePalette[i].A == 0)
transparentIndex = i;
if (!hasBlack && (sourcePalette[i].ToArgb() & 0xFFFFFF) == 0)
hasBlack = true;
}
// if transparent index is 0, relocating it and setting transparent index to 1
if (transparentIndex == 0)
{
targetPalette[0] = targetPalette[1];
transparentIndex = 1;
}
// otherwise, setting the color of transparent index the same as the previous color, so it will not be used during the conversion
else if (transparentIndex != -1)
{
targetPalette[transparentIndex] = targetPalette[transparentIndex - 1];
}
// if black color is not found in palette, counting 1 extra colors because it can be used in conversion
if (colorCount < maxColors && !hasBlack)
colorCount++;
return colorCount;
}
private unsafe static void ToIndexedTransparentByArgb(Bitmap target, Bitmap source, int transparentIndex)
{
int sourceBpp = Image.GetPixelFormatSize(source.PixelFormat);
int targetBpp = Image.GetPixelFormatSize(target.PixelFormat);
BitmapData dataTarget = target.LockBits(new Rectangle(Point.Empty, target.Size), ImageLockMode.ReadWrite, target.PixelFormat);
BitmapData dataSource = source.LockBits(new Rectangle(Point.Empty, source.Size), ImageLockMode.ReadOnly, source.PixelFormat);
try
{
byte* lineSource = (byte*)dataSource.Scan0;
byte* lineTarget = (byte*)dataTarget.Scan0;
bool is32Bpp = sourceBpp == 32;
// scanning through the lines
for (int y = 0; y < dataSource.Height; y++)
{
// scanning through the pixels within the line
for (int x = 0; x < dataSource.Width; x++)
{
// testing if pixel is transparent (applies both argb and pargb)
if (is32Bpp && ((uint*)lineSource)[x] >> 24 == 0
|| !is32Bpp && ((ulong*)lineSource)[x] >> 48 == 0UL)
{
switch (targetBpp)
{
case 8:
lineTarget[x] = (byte)transparentIndex;
break;
case 4:
// First pixel is the high nibble
int pos = x >> 1;
byte nibbles = lineTarget[pos];
if ((x & 1) == 0)
{
nibbles &= 0x0F;
nibbles |= (byte)(transparentIndex << 4);
}
else
{
nibbles &= 0xF0;
nibbles |= (byte)transparentIndex;
}
lineTarget[pos] = nibbles;
break;
case 1:
// First pixel is MSB.
pos = x >> 3;
byte mask = (byte)(128 >> (x & 7));
if (transparentIndex == 0)
lineTarget[pos] &= (byte)~mask;
else
lineTarget[pos] |= mask;
break;
}
}
}
lineSource += dataSource.Stride;
lineTarget += dataTarget.Stride;
}
}
finally
{
target.UnlockBits(dataTarget);
source.UnlockBits(dataSource);
}
}
private static PixelFormat GetPixelFormat(int bpp)
{
switch (bpp)
{
case 1:
return PixelFormat.Format1bppIndexed;
case 4:
return PixelFormat.Format4bppIndexed;
case 8:
return PixelFormat.Format8bppIndexed;
case 16:
return PixelFormat.Format16bppRgb565;
case 24:
return PixelFormat.Format24bppRgb;
case 32:
return PixelFormat.Format32bppArgb;
case 48:
return PixelFormat.Format48bppRgb;
case 64:
return PixelFormat.Format64bppArgb;
default:
throw new ArgumentOutOfRangeException("bpp");
}
}
更新: 我的电脑现在可以免费下载。它使扩展方法在
图像上可用
类型:
using KGySoft.Drawing;
/// ...
using (var stream = new FileStream(targetPngPath, FileMode.Create))
{
// You can either use an arbitrary palette,
myPngBitmap.SaveAsGif(stream, myPngBitmap.GetColors(256));
// or, you can let the built-in encoder use dithering with a fixed palette.
// Pixel format is adjusted so transparency will be preserved.
myPngBitmap.SaveAsGif(stream, allowDithering: true);
}
这可能会有所帮助。
位图类不能正确保存为透明。
您需要将位图转换为图像
互联网上有关于.NET没有正确保存透明位图的评论
这里有一个很好的链接,供进一步阅读,有太多的代码需要发布
输出gif中的黑色背景-是否来自加载、调整大小或保存?黑色背景将在保存后出现。技术上,gif透明度意味着一种颜色(最多256种)被视为透明。PNG透明度不同-它包含alpha(透明度)层。如果你能找到不在GIF中使用的颜色,然后用这种颜色替换PNG透明部分,使其透明并保存,那么你应该会成功。我认为你错了,当你加载时,它会变成黑色。一个愚蠢的解决方案可能是使用一些图像中不存在的颜色作为背景,然后在保存之前将该颜色设置为透明。这里的“技巧”并不是真正的技巧,因为它在各个方面仍然是PNG。如何在使用不安全方法时进行编译?请参见此处:如果不允许在项目中使用不安全的代码,您可以用性能较差的解决方案来替代它们。第一个不安全的块可以通过始终使用
GetPixel
方法(非常慢)的回退来避免。在不安全的方法中,您可以通过marshall.copy
将位图内容复制到常规字节数组中。在操作了字节[]
之后,你必须把它复制回来。只要问一个公开的问题,并在这里留下评论,以防我找不到它。但我不能保证会有任何帮助目前我没有足够的资源来做这件事。但是我已经开始实现一些图形扩展和库,完成后它们将被移动到GitHub。只有在忽略GetColor
的结果时,才会使用默认调色板。但是,此GetColors
实现收集源图像的前256种不同颜色(因此方法上方的TODO),但如果源实际上最多有256种颜色,但像素格式是高颜色,则这是正常的。
using KGySoft.Drawing;
/// ...
using (var stream = new FileStream(targetPngPath, FileMode.Create))
{
// You can either use an arbitrary palette,
myPngBitmap.SaveAsGif(stream, myPngBitmap.GetColors(256));
// or, you can let the built-in encoder use dithering with a fixed palette.
// Pixel format is adjusted so transparency will be preserved.
myPngBitmap.SaveAsGif(stream, allowDithering: true);
}