Saving an image with encoder properties in Visual Studio .NET

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Listing 813 Saving an image with encoder properties
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private void button1_Click(object sender, SystemEventArgs e) { ImageCodecInfo imgCodecInfo = null; Encoder encoder = null; EncoderParameter encoderParam = null; EncoderParameters encoderParams = new EncoderParameters(3); // Create a Bitmap object from a file Bitmap curBitmap = new Bitmap("rosesjpg"); // Define mimeType string mimeType = "image/tiff"; ImageCodecInfo[] encoders; encoders = ImageCodecInfoGetImageEncoders(); for(int i = 0; i < encodersLength; ++i) { if(encoders[i]MimeType == mimeType)
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imgCodecInfo = encoders[i]; } // Set color depth to 24 pixels encoder = EncoderColorDepth; encoderParam = new EncoderParameter(encoder, 24L); encoderParamsParam[0] = encoderParam; // Set compression mode to LZW encoder = EncoderCompression; encoderParam = new EncoderParameter(encoder, (long)EncoderValueCompressionLZW); encoderParamsParam[1] = encoderParam; // Set transformation to 180 degrees encoder = EncoderTransformation; encoderParam = new EncoderParameter(encoder, (long)EncoderValueTransformRotate180); encoderParamsParam[2] = encoderParam; // Save file as a TIFF file curBitmapSave("newFiletif", imgCodecInfo, encoderParams); // Dispose of object curBitmapDispose(); }
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853 Retrieving Information from Digital Images or Tagged Data of TIFF Files
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The PropertyItems property of the Image class returns an array of PropertyItem objects, which describe the attributes of an image Each instance of PropertyItem has four properties Id, Len, Type, and Value which represent the identifier, length, type, and value of the property, respectively One common use of PropertyItem is to read the tagged data of TIFF files or the information from the JPEG images taken from a digital camera Listing 814 opens a JPEG file and uses theImagePropertyItems property to get an array of PropertyItem objects After that we make a loop and read all property item IDs and values You can add this code to a button or a menu click event handler Don't forget to add a reference to the SystemDrawingImaging namespace
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Listing 814 Retrieving information from digital images
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Graphics g = thisCreateGraphics(); gClear(thisBackColor); Image curImage = ImageFromFile("DSCF0105JPG"); // Return an array of property items using // Image's PropertyItems property PropertyItem [] imgProperties = curImagePropertyItems; // Total items string str = imgPropertiesLengthToString(); MessageBoxShow("Properties "+str); // Read items and display in a message box for (int i=0; i< imgPropertiesLength; i++) { str = stringEmpty; str = "Id :"+imgProperties[i]IdToString();
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854 Converting a Bitmap to Other Formats
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Saving a bitmap as a PNG file or any another format is simple if we use ImageCodecInfo settings We create an ImageCodecInfo object with MIME type image/png and use it as the second argument to theSave method of the Bitmap class Listing 815 converts Shapesbmp to Shape0png
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Listing 815 Converting from JPEG to PNG
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private void ConvertToPNG_Click(object sender, SystemEventArgs e) { ImageCodecInfo imgCodecInfo = null; // Create a bitmap from a file Bitmap curBitmap = new Bitmap("Shapesbmp"); int j; // Set MIME type This defines the format of // the new file string mimeType = "image/png"; ImageCodecInfo[] encoders; // Get GDI+ built-in image encoders encoders = ImageCodecInfoGetImageEncoders(); // Compare with our MIME type and copy it to // ImageCodecInfo for(j = 0; j < encodersLength; ++j) { if(encoders[j]MimeType == mimeType) imgCodecInfo = encoders[j]; } // Save as PNG file curBitmapSave("Shape0png", imgCodecInfo, null); // Dispose of object curBitmapDispose(); } Listing 815 will save Shapesbmp to Shape0png You can save a file to other formats by changing the MIME type
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SUMMARY
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This chapter covered more advanced imaging concepts We discussed the SystemDrawingImaging namespace classes, their members, and how to use them At the beginning of the chapter you learned how to set grayscale images using SetPixel, LockBits, and UnlockBits In the same section we discussed how to set the color of a bitmap In the section covering the Metafile class and related functionality, you learned the metafile types supported by GDI+, how to create new metafiles, and how to read and enumerate existing metafiles We also saw how to read metafile header information The Graphics class provides methods to set the attributes of images We covered how to set the colors and other attributes of images using the color map table, color matrix, and color palette In this section we saw some real-world applications, such as drawing transparent images, wrapping images, and setting gamma values of images This chapter also discussed how to use the Encoder, EncoderParameter, EncoderParameters, and ImageCodecInfo classes and their members to encode images We discussed some real-world scenarios in which you may want to change the color depth and compression of images We also learned how to read tagged data from TIFF files and how to convert among different image formats 9 will concentrate on the SystemDrawingDrawing2D namespace
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