/// <summary>
/// 이미지 사이즈 변경
/// </summary>
/// <param name="newWidth">가로</param>
/// <param name="newHeight">세로</param>
/// <param name="image">이미지</param>
/// <returns></returns>
public static Image ResizeImage(int newWidth, int newHeight, Image image, ImageResolutionOption option = ImageResolutionOption.Nomal, AutoBackground backgroundOption = AutoBackground.None)
{
var ratioX = (double)newWidth / image.Width;
var ratioY = (double)newHeight / image.Height;
var ratio = Math.Min(ratioX, ratioY);
var maxWidth = (int)(image.Width * ratio);
var maxHeight = (int)(image.Height * ratio);
var newImage = new Bitmap(newWidth, newWidth);
using (var graphics = Graphics.FromImage(newImage))
{
switch (option)
{
case ImageResolutionOption.HighQuality:
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
break;
case ImageResolutionOption.High:
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
break;
case ImageResolutionOption.Nomal:
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
break;
case ImageResolutionOption.Row:
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;
break;
case ImageResolutionOption.PreferCapacity:
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighSpeed;
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
break;
}
switch (backgroundOption)
{
case AutoBackground.None:
break;
case AutoBackground.BlackFill:
graphics.Clear(ColorTranslator.FromHtml("#000000"));
break;
case AutoBackground.WhiteFill:
graphics.Clear(ColorTranslator.FromHtml("#FFFFFF"));
break;
case AutoBackground.TransparencyFill:
graphics.Clear(Color.Transparent);
break;
case AutoBackground.AutoFill:
string backgroundColor = PixelColorFrequency(image).Keys.First();
graphics.Clear(ColorTranslator.FromHtml(backgroundColor.Equals('#') ? backgroundColor : "#" + backgroundColor));
break;
}
// Calculate x and y which center the image
int y = (newHeight / 2) - maxHeight / 2;
int x = (newWidth / 2) - maxWidth / 2;
// Draw image on x and y with newWidth and newHeight
graphics.DrawImage(image, x, y, maxWidth, maxHeight);
}
return(newImage);
}
/// <summary>
/// 이미지 사이즈 변경
/// </summary>
/// <param name="newWidth">가로</param>
/// <param name="newHeight">세로</param>
/// <param name="path">이미지 경로</param>
/// <returns></returns>
public static Image ResizeImage(int newWidth, int newHeight, string path, ImageResolutionOption option = ImageResolutionOption.Nomal, AutoBackground backgroundOption = AutoBackground.None)
{
if (path.Contains("http"))
{
return(ResizeImage(newWidth, newHeight, getImageFromURL(path), option, backgroundOption));
}
else
{
return(ResizeImage(newWidth, newHeight, new Bitmap(path), option, backgroundOption));
}
}
