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ReaCompressor 1.8 - User Guide and FAQ

Screenshots - More Details


Some tricks and tips


  1. To open a new image you want to be compressed just double click the Original panel.
  2. To quickly create JPG, GIF, PNG or TIF image just double click the Automatically create JPG (GIF/PNG/TIF) box in the JPG (GIF/PNG/TIF) panel.
  3. Use shortcuts Ctrl+1, 2, 3, 4 to quickly switch between JPG, GIF, PNG and TIF panels correspondingly.
  4. Zoom setting will be applied to all images. If you change a viewing area of one image then it will be changed for all other images. So, you will be able to compare the same part of an image in Original, JPG, GIF, PNG and TIF panels.
  5. When you mirror (rotate, resize) an image it will be mirrored (rotated, resized) in Original panel first and then images with Automatically create option will be re-created.
  6. Use shortcut Ctrl+C to copy an image from JPG, GIF, PNG or TIF panel to clipboard.
  7. Paste from clipboard (Ctrl+V) command will replace an image in Original panel and images checked in Automatically create section will be re-created.

It supports 340+ input file formats including the following :


-TIFF Bitmap (TIF, TIFF)
- CompuServe Bitmap (GIF)
- JPEG Bitmap (JPG, JPEG, JPE)
- PaintBrush (PCX)
- Windows Bitmap (BMP, DIB, RLE)
- Windows Icon (ICO)
- Windows Cursor (CUR)
- Portable Network Graphics (PNG)
- Windows Metafile (WMF)
- Enhanced Windows Metafile (EMF)
- Targa Bitmap (TGA, TARGA, VDA, ICB, VST, PIX)
- Portable Pixmap, GreyMap, BitMap (PXM, PPM, PGM, PBM)

Frequently Asked Questions - ReaCompressor

  1. How to get more compression?

    PG settings: JPG is a loss compression format, it means that a compressed image will lose its quality anyway, yet you can significantly reduce a file size with relatively low quality loss. You can change JPG quality and Smooth factor to get best quality and smallest file size of compressed image. JPG quality can vary from 1% (lowest quality and smallest file size) 100% (highest quality and largest file size).

    Smooth factor can vary from 0 (no smoothing) to 100 (max smoothing). If Smooth factor is not zero then an image will be smoothed before compression. Smoothing improves compression ratio. Use region compression option will allow you to produce JPG files some areas of which are compressed more or less than others. For example, you can set a high quality for most important parts of an image and lower for the rest. The resulting image looks almost as an original, having significantly smaller file size.

    GIF setting : GIF is a loss compression format; an image you want to be compressed will be converted to 2, 4, 8, 16, 32, 64, 128 or 256 colors. The less number of colors you choose, the more compression you can get.

    PNG setting : There are two types of PNG files: lossy and lossless. You can choose Lossless compression option if you need compress an image without any quality losses. However, lossless PNG files are often much larger than JPG or GIF files of the same image. So if you do not need a lossless compression you can uncheck Lossless compression box and specify number of colors similar to GIF compression.

    TIF setting : TIF is a good lossless compression format especially for black white images (scanned faxes, scripts, books). You can also create color TIF files; note that such files will be much larger than PNG files. Choose Convert to black white option if you want compress an image using very effective compression methods: CCITT Group 3, 1D; CCITT Group 3, 2D; CCITT Group 4, 2D. You can also specify dpi resolution for TIF file, it will not affect the file size.


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