My app make screenshot using methods from WinAPI. Screen is ok, it is saved as gif and has 76 kB. Jpg, png and other formats have more size. I have to send this file via net and it takes several seconds, about 2-3 seconds. It is posibility to compress this file in .NET or any free external software ? Quality don't have good, because I have to read only several labels.
Thanks
You could look at resizing the image in c#. It's fairly easy to do... here's some code I've used in the past to do this:
Image image = Image.FromFile(fi.FullName);
image = resizeImage(image, new Size(120, 120));
EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)85);
ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg");
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;
image.Save(OutSourceLoc + "/" + fi.Name, jpegCodec, encoderParams);
static Image resizeImage(Image imgToResize, Size size)
{
int sourceWidth = imgToResize.Width;
int sourceHeight = imgToResize.Height;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)size.Width / (float)sourceWidth);
nPercentH = ((float)size.Height / (float)sourceHeight);
if (nPercentH < nPercentW)
nPercent = nPercentH;
else
nPercent = nPercentW;
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap b = new Bitmap(destWidth, destHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
b.SetResolution(300, 300);
Graphics g = Graphics.FromImage((Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighSpeed;
g.SmoothingMode = SmoothingMode.HighSpeed;
g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
g.Dispose();
return (Image)b;
}
private static ImageCodecInfo GetEncoderInfo(string mimeType)
{
// Get image codecs for all image formats
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
// Find the correct image codec
for (int i = 0; i < codecs.Length; i++)
if (codecs[i].MimeType == mimeType)
return codecs[i];
return null;
}