Bitmap manipulation algorithms

Transform images

Graphics Mill features interpolation modes which beat classic bilinear and even bicubic algorithms!

• Resize (with an option to preserve sharpness)
• Rotate
• Crop (including automatic cropping)
• Perspective
• Warp an image to any surface (bitmap mapping)

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Generate thumbnails efficiently

Looking to create thumbnails for large amount of image files without memory and CPU overhead? Here is the best way to do it using Graphics Mill:

• If the file contains a thumbnail in EXIF, extract it
• Otherwise, partially decode JPEG to receive the image of a right scale.
• If it is a non-JPEG, resize the image on-the-fly (no need to load the entire bitmap).

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Lossless JPEG operations

JPEG is a lossy compression algorithm. If you run several cycles of decoding/encoding of the same image, its quality will degrade significantly. Fortunately, if you need to edit a JPEG image you don't have to experience this. With Graphics Mill these algorithms can be applied without JPEG recompression:

• Flip or rotate 90, 180 or 270 degrees.
• Crop.
• Resize 2048 to 512 and similar sizes.
• Draw text line (re-encode only the image portion under the text).
• Remove red eyes (re-encode the eyes only).
• Update metadata

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Image enhancement

Pictures the users take are not often ideal. Fortunately many of them can be easily enhanced automatically. Graphics Mill supports:

• Auto-levels (histogram equalization)
• Unsharp mask

You can give your users a Photoshop-level control over the color and tone adjustment:

• Levels
• Curves
• Hue/Saturation/Lightness
• Brightness/Contrast
• Channel Balance

You can modify the entire bitmap or individual channels. Moreover, you can reach more natural results by transforming the image to Lab pixel format and edit a Lightness channel individually.

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