Leadtools.Drawing Introduction

LEADTOOLS Image Processing includes over 200 functions, some of which are typically found only in high performance end-user programs such as Adobe PhotoShop®. The image processing functions are separated into four categories: Transforms, Filters, Color Conversion and Drawing. Additionally, LEADTOOLS image processing functions support region of interest, allowing only a particular region of an image to be processed.

Key Features:

Change the appearance of the image in a bitmap

• Define the bitmap as a display surface where you can use Windows graphics device interface (GDI) functions for drawing or adding text.
• Automatically straighten (deskew) a 1-bit image.
• Remove specks (despeckle) a 1-bit image.
• Automatically trim a bitmap to remove blank space around the edges.
• Rotate the image. (Angles can be precise to 100th of a degree.)
• Do fast rotation in 90-degree increments.
• Rotate JPEG or CMP compressed images in 90 degree increments or flip them without loss of quality.
• Shear the image in the fashion of a parallelogram. (Angles are precise to 100th of a degree.)
• Change the orientation by flipping the image horizontally or vertically.

Adjust colors and intensities:

• Change brightness using a flat scale.
• Change brightness using gamma correction.
• Change contrast using a flat scale.
• Change contrast using a multi-scale.
• Stretch the range of intensities.
• Remap intensities using a lookup table.
• Create look up tables based on points on a curve or a mathematical function.
• Invert colors.
• Change hue of the entire image or just a range of colors.
• Change saturation.
• Histogram equalize and histogram contrast.
• Fill with a specified color.
• Get and put colors of individual pixels.
• Color balancing.
• Load CMYK TIFF files and keep the data in memory as CMYK.

Apply conversions:

• Halftone for display or printing.
• Sharpen or blur.
• Posterize, specifying the number of color planes.
• Mosaic, specifying the tile size.
• Emboss, specifying the lighting direction.
• Soften an image using an average filter.
• Reduce noise using a median or Gaussian filter.
• Add noise in any or all color planes.
• Picturize with a list of images or a single image.

Apply filters to:

• Detect ranges of intensity.
• Detect ranges of colors using different color spaces.
• Detect edges using gradient or Laplacian edge detection.
• Detect lines using Sobel, Prewitt, shift and difference, or line segment detection.
• Apply morphological (binary) filters to erode or dilate black objects*.
• Implement your own spatial filters.
• Combine images using boolean and arithmetic operators, and color masking. (This is useful for combining filtered images with originals.)
• Combine two images so that one appears to be an underlying texture of the other.
• Combine multiple images to create a new image that resembles the current image.
• Combine a list of images to find the average difference between the images.
• Redeye removal.
• Anti-alias the image.*
• Apply a sepia or "old photo" look to the image.
• Apply an oil-painting effect.
• Apply a solarization effect.
• Apply Fourier Transforms to images.
• Apply 3D effects: Tunnel, plane, plane bend, etc.
• Apply many other effects including: Swirl, Ripple, Radial Blur, Impressionist, Wave, Shear, Remove Redeye, Cubism, Glow, Age, etc.

Use medical imaging processing functions to:

• Create Kaufmann regions. The created regions can be used to determine the Kaufmann ratio, which is the size of the corpus callosum divided by the size of the brain sphere.
• Extract the individual slices from a radiographic scanned film.

Apply image optimization to:

• An image buffer in memory
• An entire directory of images, saving the optimized images to another directory

Optimize the following formats using the Image Optimizer DLL functions:

• JPEG File (FILE_JPEG).
• JPEG 411 File (FILE_JPEG_411).
• JPEG 422 File (FILE_JPEG_422).
• EXIF JPEG 4:1:1 File (FILE_EXIF_JPEG_411).
• EXIF JPEG 4:2:2 File (FILE_EXIF_JPEG_422).
• GIF File (FILE_GIF).
• PNG File (FILE_PNG).
• BMP Without RLE Compression File (FILE_BMP).
• BMP With RLE Compression File (FILE_BMP_RLE).

Use low-level functions to change parts of an image:

• Get and put rows of image data.
• Get and put parts of rows.
• Get and put the colors of individual pixels.
• Process a region within a bitmap.