Tonal range is an important attribute of an image, especially photographs, when trying to improve OCR results. Tonal range is the range of tones between the lightest and darkest areas of an image and is also known as contrast. An image with a wide range has both very dark (black) and very light (white) elements. An image with a narrow range is more limited in its tonal scope, which is usually in the mid-ranges (varying shades of grays).

Recently, a customer needed to find the differences between two images. More specifically the customer needed to find what changed between the two images and crop to leave only the change. From there, the LEADTOOLS OCR engine converted the cropped image to text to create a screen reader for visually impaired users. Additionally, animation and compression algorithms use similar techniques to improve performance and efficiency.

Support quickly responded to the customer with a C# console application example that finds the bounding rectangle of the differences and then crops the image.

As part of the LEAD Technologies 25th anniversary, we are creating 25 projects in 25 days to celebrate LEAD's depth of features and ease of use. Today's project comes from Amin.

What it Does

This C# WinForms application compares images with various image processing algorithms using LEADTOOLS Version 19.

As part of the LEAD Technologies 25th anniversary, we are creating 25 projects in 25 days to celebrate LEAD's depth of features and ease of use. Today's project comes from Aaron.

What it Does

This C# WinForms project will load a multi-page image and reverse the pages to create a reverse-playback GIF using LEADTOOLS Version 19.

As part of the LEAD Technologies 25th anniversary, we are creating 25 projects in 25 days to celebrate LEAD's depth of features and ease of use. Today's project comes from Joe.

What it Does

This Objective-C project will process images using LEADTOOLS Version 18.