i want to watermark pictures with different sizes in one folder. the watermark has 3891 x 4118 pixels. the pictures i want to watermark have nearly the same size or way lower.
however, the watermark image should always have the same size on the images. therefore i take the width of image i want to watermark, multiple it by 0.2 (20%) and the height of the watermark image gets calculated by the ratio. (see code below).
after that, i resize the watermark image and put it on on the image i want to watermark. so far so good, but the problem is, that the image is way smaller than it should be. the calculation works fine, even if i say, put the image as is (3891 x 4118 pixel), it calculates it correctly, but the watermark doesn't get bigger. it stays on a size i didn't calulcate.
that's the button to load the folder.
private void DateiLaden_Click(object sender, RoutedEventArgs e)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();
DialogResult result = fbd.ShowDialog();
try
{
string[] files = GetFiles(fbd.SelectedPath.ToString(), "*.jpg|*.jpeg"); //Only select JPG pictures, method below
int anzahlBilder = files.Length;
if (anzahlBilder <= 0)
{
System.Windows.Forms.MessageBox.Show("No images!");
} // if there are no images, stop processing...
else
{
var res = checkImageSize(files); //check if they have a minmal size, method below
if (res == "") //if everythings fine, continue
{
Directory.CreateDirectory(fbd.SelectedPath.ToString() + "\\watermarked"); //create new directory of the selected folder, folder so save the watermarked images
System.Drawing.Image brand = System.Drawing.Image.FromFile("../../watermark.png"); //load watermark
double imageHeightBrand = Convert.ToDouble(brand.Height); //get height (4118px)
double imageWidthBrand = Convert.ToDouble(brand.Width); //get width (3891px)
double ratioBrand = imageWidthBrand / imageHeightBrand; //get ratio (0.94487615347)
foreach (var file in files)
{
System.Drawing.Image img = System.Drawing.Image.FromFile(file); //load image to watermerk to get width and height
double imageHeightBild = Convert.ToDouble(img.Height); //height of the image to watermark
double imageWidthBild = Convert.ToDouble(img.Width); //width of the image to watermark
//Landscape
if (imageWidthBild > 640.0 && imageHeightBild > 425.0)
{
var imageWidthTmpBranding = imageWidthBild * 0.2; //the watermark width, but only 20% size of the image to watermark
var imageHeightTmpBranding = imageWidthTmpBranding / ratioBrand; //height of watermark, preserve aspect ratio
int imageWidthBranding = Convert.ToInt32(imageWidthTmpBranding); //convert in into int32 (see method below)
int imageHeightBranding = Convert.ToInt32(imageHeightTmpBranding); //convert in into int32 (see method below)
var watermark = ResizeImage(brand, imageWidthBranding, imageHeightBranding); //resize temporally the watermark image, method below
System.Drawing.Image image = System.Drawing.Image.FromFile(file); //get image to watermark
Graphics g = Graphics.FromImage(image); //load is as graphic
g.DrawImage(watermark, new System.Drawing.Point(50, 50)); //draw the watermark on it
image.Save(fbd.SelectedPath.ToString() + "\\watermarked\\" + returnOnlyImageName(file)); //save it in the folder with the same file name, see method below.
}
//Portrait
/* if(imageWidthBild > 350 && imageHeightBild > 520) {
}*/
}
}
else
{
System.Windows.Forms.MessageBox.Show(res);
}
}
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
}
}
"methods below"
private static string[] GetFiles(string sourceFolder, string filters)
{
return filters.Split('|').SelectMany(filter => System.IO.Directory.GetFiles(sourceFolder, filter)).ToArray();
}
private static string checkImageSize(string[] files)
{
string message = "The following pictures are too small:\n";
foreach (var file in files)
{
Bitmap img = new Bitmap(file);
var imageHeight = img.Height;
var imageWidth = img.Width;
if ((imageWidth < 640 && imageHeight < 425) || (imageWidth < 350 && imageHeight < 520))
{
message += returnOnlyImageName(file) + "\n";
}
}
if (message == "The following pictures are too small:\n")
{
return "";
}
else
{
message += "\nPlease change those pictures!";
return message;
}
}
private static string returnOnlyImageName(string file)
{
return file.Substring(file.LastIndexOf("\\")+1);
}
public static Bitmap ResizeImage(System.Drawing.Image image, int width, int height)
{
var destRect = new System.Drawing.Rectangle(0, 0, width, height);
var destImage = new Bitmap(width, height);
destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (var graphics = Graphics.FromImage(destImage))
{
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
using (var wrapMode = new ImageAttributes())
{
wrapMode.SetWrapMode(WrapMode.TileFlipXY);
graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
}
}
return destImage;
}
and is it also anyhow possible to save all the watermarks in the bottom right corner?
thanks in regards
Here you go...
void waterMarkOnBottomRight(Image img, Image watermarkImage, string saveFileName)
{
double imageHeightBrand = Convert.ToDouble(watermarkImage.Height);
double imageWidthBrand = Convert.ToDouble(watermarkImage.Width);
double ratioBrand = imageWidthBrand / imageHeightBrand;
double imageHeightBild = Convert.ToDouble(img.Height); //height of the image to watermark
double imageWidthBild = Convert.ToDouble(img.Width);
var imageWidthTmpBranding = imageWidthBild * 0.2; //the watermark width, but only 20% size of the image to watermark
var imageHeightTmpBranding = imageWidthTmpBranding / ratioBrand; //height of watermark, preserve aspect ratio
int imageWidthBranding = Convert.ToInt32(imageWidthTmpBranding); //convert in into int32 (see method below)
int imageHeightBranding = Convert.ToInt32(imageHeightTmpBranding);
int watermarkX = (int)(imageWidthBild - imageWidthBranding); // Bottom Right
int watermarkY = (int)(imageHeightBild - imageHeightBranding);
using (Graphics g = Graphics.FromImage(img))
g.DrawImage(watermarkImage,
new Rectangle(watermarkX, watermarkY, imageWidthBranding, imageHeightBranding),
new Rectangle(0, 0, (int)imageWidthBrand, (int)imageHeightBrand),
GraphicsUnit.Pixel);
img.Save(saveFileName);
}
This one's working for landscape (width > height).
Well.. in your code, you don't have to create separate instances for images for calculating, for creating graphics, add a new bitmap and paint using graphics and all. You do anything with the image, its in the memory. And its not going to affect the watermark image on your disk.