Sometimes repetitive image can be met in a report, for example, company logos on the header of each page. If do not process such duplicates then a report after export will have big size. Some formats allows exporting only one image and then refer to it from different parts of a document. In Stimulsoft Reports, there is a special class that calculates check sums and searches and processes duplicates. Image processing may slow down the process of exporting, so it is possible to disable this feature. Each export has its own property to enable or disable image comparison. By default this property is always enabled.