I need to cut a .jpg image from top of 20 pixels.
I have this code to associate the image to the object:
iTextSharp.text.Rectangle rect = pdf.AcroFields.GetFieldPositions("BarCode")[0].position;
iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(Application.StartupPath + segnacollo.BarCode);
img.ScaleAbsoluteHeight(rect.Height);
img.ScaleAbsoluteWidth(rect.Width);
img.SetAbsolutePosition(rect.Left, rect.Bottom);
pdf.GetOverContent(1).AddImage(img);
Thanks
Please take a look at the answer to the question How to give an image rounded corners?
In this example, we clip an image so that it gets rounded corners:
Image img = Image.GetInstance(some_path_to_an_image);
float w = img.ScaledWidth;
float h = img.ScaledHeight;
PdfTemplate t = writer.DirectContent.CreateTemplate(w, h);
t.Ellipse(0, 0, w, h);
t.Clip();
t.NewPath();
t.AddImage(img, w, 0, 0, h, 0, -600);
Image clipped = Image.GetInstance(t);
You want to remove part of the top of the image, you can make your code even simpler:
Image img = Image.GetInstance(some_path_to_an_image);
float w = img.ScaledWidth;
float h = img.ScaledHeight;
PdfTemplate t = writer.DirectContent.CreateTemplate(w, h - 20);
t.AddImage(img, w, 0, 0, h, 0, 0);
Image clipped = Image.GetInstance(t);
In this example, I created a PdfTemplate that is 20 user units smaller than the original image. I add the original image to that template, and I create a new image from that template.
Important: this visually clips the image in the sense that you won't see the top strip (20 user units high) in the PDF. However, if you extract the image from the PDF, you'll see that the complete image is present in the document.
Related
When i run the program, i get a different amount of images(from 20 all the way up to 2000) and i would like to merge all of these images into one image which would preferably be a square.
This is the code i have for getting the file images(the images are in URL format)
int ximg = 1;
int totalImgs = richTextBox1.Lines.Count();
while (ximg < totalImgs)
{
System.Net.WebRequest request = System.Net.WebRequest.Create(richTextBox1.Lines[ximg]);
System.Net.WebResponse response = request.GetResponse();
System.IO.Stream responseStream =
response.GetResponseStream();
Bitmap image = new Bitmap(responseStream);
List<Image> fileList = new List<Image>();
fileList.Add(image);
ximg++;
}
Also every single image has a title in a different richtextbox which i would like to know if it is possible to add a title under the image (richtextbox1.lines[1] (image) = richtextbox2.lines[1] (title)). Is it possible to add a picture as a background picture when merging(to the square image I want to generate)? Is it possible to add a border on every single image picture and merge them with the border? How can the code calculate when its time to change line and start adding images in the next row?
I've tried this code, but it works only if you know the amount of images you want to merge.
Bitmap bitmap = new Bitmap(image1.Width + image2.Width, Math.Max(image1.Height, image2.Height));
using (Graphics g = Graphics.FromImage(bitmap))
{
g.DrawImage(image1, 0, 0);
g.DrawImage(image2, image1.Width, 0);
}
bitmap.Save("merged.bmp");
I would do it with photoshop but when there are 2000 images to merge together, I just do not have the time.
Is there any way to accomplish such task? Any references would be appreciated!
I have mentioned it above :) !
This solution will create a mosaic of the images from left to right, top to bottom. It does not do anything to maximize the available space. It also assumes that you have a max width and height for the finished image, since it's not realistic to support an arbitrary size.
// where we store the finished mosaic
var mosaic = new Bitmap(maxWidth, maxHeight);
// track the location where we are drawing each image
var imageCorner = new Point(0,0);
// track the height of the current row
var currentRowHeight = 0;
// track the width and height of the mosaic as it grows.
var mosaicWidth = 0;
var mosaicHeight = 0;
using (var g = Graphics.FromImage(bitmap))
{
var borderPen = new Pen(Brushes.Black) { Width = 2 };
var labelFont = new Font("Arial", 10);
var labelBrush = new SolidBrush(Color.Black);
foreach (var image in imageList)
{
if (imageCorner.X + image.Width > maxWidth)
{
// if adding the image to the current row would make it too wide,
// move to the next row by resetting X to zero and adding the
// height of the tallest image to Y
imageCorner.X = 0;
imageCorner.Y += currentRowHeight;
// since this is a new row, it's current height is zero
currentRowHeight = 0;
}
// if adding this image would put us past the
// height of the image, then we're out of room.
if (imageCorner.Y + image.Height > maxHeight)
{
// this skips images if there's no room for them in
// the mosaic, you may want to do something different
Trace.WriteLine($"Image is {image.Height} pixels tall, but only {maxHeight - mosaicHeight} pixels available.");
continue;
}
// draw the image
g.DrawImage(image, imageCorner);
// draw the border
g.DrawRectangle(borderPen,
imageCorner.X, imageCorner.Y,
image.Width, image.Height)
// draw the label
g.DrawText("Image Label", labelBrush, imageCorner.X, imageCorner.Y)
// now that we've drawn the image, we need to shift to the right
imageCorner.X += image.Width;
// row height is the height of the tallest image so far in this row
currentRowHeight = Math.Max(image.Height, currentRowHeight);
// track the total height of the mosaic
mosaicHeight = imageCorner.Y + currentRowHeight;
// mosaic width is just the widest row in the mosaic
mosaicWidth = Math.Max(imageCorner.X, widthOfWidestRow);
}
}
// trim off the parts of the mosaic we didn't fill
mosaic = mosaic.Clone(new Rectangle(0, 0, mosaicWidth, mosaicHeight);
mosaic.Save("merged.bmp");
If you wanted to minimize wasted space, you could sort your list of images in different ways, or calculate ahead of time what a good width and height for the mosaic would be.
I using Imaemagick and c# and wondering:
Is it possible to crop image to border without exactly sizes?
From first to second?
First image
Second
To remove the white space around the sudoku square you can loop over the pixels. Since the image is black and white it makes it a lot easier because we can check when any of the R, G or B values drop below a certain white threshold and become black.
In this example, I'm just using an arbitrary 200 value to check.
I'm walking in from the top left and bottom right corners. This will only work if your image is always a perfect square. but you can easily adjust this code to check coordinates more accurately to meet your purposes.
using (var image = new Bitmap(Image.FromFile("firstImage.jpg")))
{
int topX = 0, topY = 0;
int bottomX = image.Width - 1, bottomY = image.Height - 1;
var color = image.GetPixel(topX, topY);
while(color.R > 200)
color = image.GetPixel(++topX, ++topY);
color = image.GetPixel(bottomX, bottomY);
while(color.R > 200)
color = image.GetPixel(--bottomX, --bottomY);
Bitmap croppedImage = new Bitmap(image);
Rectangle cropRect = new Rectangle(topX, topY, bottomX - topX + 1, bottomY - topY + 1);
croppedImage = croppedImage.Clone(cropRect, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
croppedImage.Save("firstImageNoBorder.jpg");
}
Original:
Cropped:
I'm trying to generate a custom Bitmap through code at a very small size and display it to a PictureBox, upscaled to fit said PictureBox. I am using the graphics object to do this in order to use NearestNeighbor interpolation to upscale single pixels perfectly.
I'm using the graphics object of a temporary default image that is in the PictureBoxs "Image" component on Form.Load, which is sized to be the perfect width and height to maintain the correct aspect ratio from the original Bitmap.
Here is the relevant code:
private void Form1_Load(object sender, EventArgs e)
{
bmp = new Bitmap(16, 9, PixelFormat.Format24bppRgb);
rnd = new Random();
GenerateImage();
}
private void GenerateImage()
{
for (int x = 0; x < bmp.Width; x++)
{
for (int y = 0; y < bmp.Height; y++)
{
int num = rnd.Next(2);
if (num == 0)
{
bmp.SetPixel(x, y, Color.White);
}
else
{
bmp.SetPixel(x, y, Color.Gold);
}
}
}
Bitmap image = new Bitmap(picOutput.Image);
grp = Graphics.FromImage(image);
grp.InterpolationMode = InterpolationMode.NearestNeighbor;
grp.DrawImage(
bmp,
new Rectangle(0, 0, image.Width, image.Height),
0,
0,
bmp.Width,
bmp.Height,
GraphicsUnit.Pixel
);
grp.Dispose();
picOutput.Image = image;
}
The problem is that the Bitmap seems to be drawn incorrectly. About half a pixel from the original Bitmap is cut off on the left and top edges of the Bitmap when displayed through the PictureBox, and that roughly half a pixel shows up as the original default image on the right and bottom edges. It's almost like the Bitmap was offset up and to the left while being drawn by the graphics object, it doesn't perfectly cover up the original default image like it was supposed to.
My first thought was the PictureBoxs SizeMode, which is still set to "Normal," but none of them change the problem at all. Here is a picture of the problem. The black edges on the right and bottom are part of the temporary default image (the image I used graphics from), which is completely black and covers the entire PictureBox area.
Can anyone offer some insight?
As user Jimi pointed out in a comment, grp.PixelOffsetMode = PixelOffsetMode.Half from this post solved the issue.
Anyone ever wrote a C# GDI+ function to curl the corner of a BITMAP. I need to be able to take a static image and apply the peel effect to it on the bottom right corner. And I need to do it with C# all my searching leads to CSS3/FLASH/SilverLight virtual book type examples. I just want to create a static image that has a curled up corner and save the file.
Any Ideas?
Ok so I made the image with photo shop so that I can show you what I am trying to achieve
I start this image
and I want to write some C# code that would yield this image
The end result is just an image that is not animated, and does nothing. Any thoughts.
There are some good tools to do this, such as Fred's ImageMagick plugin script, but here is a C# version as requested.
using System.Drawing.Imaging;
public partial class ImagePeelEffect : Form
{
string WorkingDirectory = #"C:\temp\";
public ImagePeelEffect()
{
InitializeComponent();
}
private void ImagePeelEffect_Load(object sender, EventArgs e)
{
picBefore.Image = Image.FromFile(WorkingDirectory + "\\before.jpg");
}
private void button1_Click(object sender, EventArgs e)
{
//create a image object containing the photograph to add page peel effect
Image imgPhoto = Image.FromFile(WorkingDirectory + "\\before.jpg");
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//create a image object containing the PagePeel
Image imgPagePeel = new Bitmap(WorkingDirectory + "\\PagePeel.bmp");
int ppWidth = imgPagePeel.Width;
int ppHeight = imgPagePeel.Height;
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//The first step in manipulating the PagePeel image is to replace
//the background color with one that is transparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and define ImageAttributes with a RemapTable
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
//My PagePeel was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
//Set the Remap Table with the old and new color map
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//For this example we will place the PagePeel in the bottom right
//hand corner of the photograph
int xPosOfPp = phWidth - ppWidth;
int yPosOfPp = phHeight - ppHeight + 1;
grPhoto.DrawImage(imgPagePeel,
new Rectangle(xPosOfPp, yPosOfPp, ppWidth, ppHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
ppWidth, // PagePeel Width
ppHeight, // PagePeel Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto = bmPhoto;
grPhoto.Dispose();
//save new image to file system.
imgPhoto.Save(WorkingDirectory + "\\after.jpg", ImageFormat.Jpeg);
imgPhoto.Dispose();
imgPagePeel.Dispose();
//Show the After image
picAfter.Image = Image.FromFile(WorkingDirectory + "\\after.jpg");
}
The PagePeel.bmp:
The Before and After result:
Update
Here's a version that uses a Transparent Page Peel overlay so you dont neet to convert the "green screen" to invisible. The advantage of this method is when the original photograph contains the colour green RGB(0,255,0) it wont be turned into transparent:
TransparentPagePeel.png:
private void button2_Click(object sender, EventArgs e)
{
//create a image object containing the photograph to add page peel effect
Image imgPhoto = Image.FromFile(WorkingDirectory + "\\before.jpg");
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//create a image object containing the PagePeel
Image imgPagePeel = new Bitmap(WorkingDirectory + "\\transparentPagePeel.png");
int ppWidth = imgPagePeel.Width;
int ppHeight = imgPagePeel.Height;
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//For this example we will place the PagePeel in the bottom right
//hand corner of the photograph
int xPosOfPp = phWidth - ppWidth;
int yPosOfPp = phHeight - ppHeight + 1;
grPhoto.DrawImage(imgPagePeel,
new Rectangle(xPosOfPp, yPosOfPp, ppWidth, ppHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
ppWidth, // PagePeel Width
ppHeight, // PagePeel Height
GraphicsUnit.Pixel, // Unit of measurment
null); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto = bmPhoto;
grPhoto.Dispose();
//save new image to file system.
imgPhoto.Save(WorkingDirectory + "\\after1.jpg", ImageFormat.Jpeg);
imgPhoto.Dispose();
imgPagePeel.Dispose();
picAfter.Image = Image.FromFile(WorkingDirectory + "\\after1.jpg");
}
Is there any open source library for drawing text to image in C#? I have been strugling with TextRenderer and graphics.DrawString() whole day but I never got close to getting decent results, I tried every combination of Smoothing, Interpolation, TextRenderHint but quality is always semi-decent.
Here are some images and that is best I achived:
How it needs to look like:
This really looks good but with some strings seems like character spacing is wrong with some letters and the string leans.
Settings are:
objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
objGraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.GammaCorrected;
objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
objGraphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
objGraphics.TextContrast = 0;
Format is Png and background is transparent, method is TextRenderer.Drawtext(). Seems like thickness of text is wrong, I assume it's something wrong with smoothing, when I try to bold text it stays almost the same, but only with font size of ~10px.
Here's what I use to add a Copyright watermark to photos uploaded to my website:
//Add Watermark to photo.
private System.Drawing.Image CreateWatermark(System.Drawing.Image imgPhoto, string Copyright)
{
Graphics g = Graphics.FromImage(imgPhoto);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
foreach (PropertyItem pItem in imgPhoto.PropertyItems)
{
imgPhoto.SetPropertyItem(pItem);
}
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//------------------------------------------------------------
//Step #1 - Insert Copyright message
//------------------------------------------------------------
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i = 0; i < 7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font("arial", sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Copyright, crFont);
if ((ushort)crSize.Width < (ushort)phWidth)
break;
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight * .05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth / 2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Near;
//define a Brush which is semi trasparent black (Alpha set to 153)
SolidBrush semiTransBrush2 = new SolidBrush(System.Drawing.Color.FromArgb(153, 0, 0, 0));
//Draw the Copyright string
grPhoto.DrawString(Copyright, //string of text
crFont, //font
semiTransBrush2, //Brush
new PointF(xCenterOfImg + 1, yPosFromBottom + 1), //Position
StrFormat);
//define a Brush which is semi trasparent white (Alpha set to 153)
SolidBrush semiTransBrush = new SolidBrush(System.Drawing.Color.FromArgb(153, 255, 255, 255));
//Draw the Copyright string a second time to create a shadow effect
//Make sure to move this text 1 pixel to the right and down 1 pixel
grPhoto.DrawString(Copyright, //string of text
crFont, //font
semiTransBrush, //Brush
new PointF(xCenterOfImg, yPosFromBottom), //Position
StrFormat); //Text alignment
imgPhoto = bmPhoto;
return imgPhoto;
}
Using System.Drawing classes in ASP.NET is not supported.
Specifically, if you use it, under load from multiple threads, you will experience exceptions like this one:
Win32Exception: The operation completed successfully
at MS.Win32.HwndWrapper..ctor(Int32 classStyle, Int32 style, Int32 exStyle, Int32 x, Int32 y, Int32 width, Int32 height, String name, IntPtr parent, HwndWrapperHook[] hooks)
at System.Windows.Media.MediaContextNotificationWindow..ctor(MediaContext ownerMediaContext)
at System.Windows.Media.MediaContext..ctor(Dispatcher dispatcher)
That said, we discovered that marshaling all drawing operations to a single STA thread seemed to avoid these issues.
UPDATE: It's been five years and we still have no problem with this approach.