Applies to: All versions of Ephesoft Transact

This article will help you understand the recommended compression parameters when configuring the IMPORT_MULTIPAGE_FILES plugin. For more information on the plugin and its use, refer to Import Multipage Files Plugin.

Important: The following parameters are only applicable when the Image Conversion Process is set to IMAGE_MAGICK.

Compression Parameters

ImageMagick provides various compression parameters to compress an image, which varies depending on the quality and size of your original image file:

• Uncompressed images
• Compressed images
• Good quality, single-page TIF files
• High-resolution images

Uncompressed images

Use a suitable ImageMagick compression parameter that will reduce the size of the image.

• Colored images: “-compress LZW” or “-compress JPEG”
• Black and white images: “-compress Group4”

Compressed images

Use the same compression parameter that was previously used to compress the original image.

For example, already compressed images with JPEG compression should use the “-compress JPEG” parameter.

Note: This may increase the size of the image by a small delta, but will maintain the consistency in quality.

Good quality, single-page TIF files

Use any of the following parameters to reduce the size of the image—depending on your specific use case:

• “-quality”
• “-depth”
• “-scale”

Note: In cases where compression is done with image depth, “-depth 1” can be used, which creates black and white images. This is faster than applying compression on black and white images using “-compress Group4”

High-resolution images

If an image resolution is above a particular threshold, then it can be resized to the threshold resolution to reduce the file size and potentially speed up the OCR process.

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For more information on ImageMagick compression parameters, refer to the following reference list from ImageMagick.