The JPG compression was designed for photographic-type images, which are characterized by gradual changes in color and intensity.

You should NOT use the JPG format for a graphic like an Excel chart. If you try to resize a bitmap, you may get a jagged appearance, and the weights of lines may be irregular, depending on where rows or columns of pixels are inserted or removed to achieve the new size. You should resize your chart before exporting, because a bitmap saves information for the pixels on your monitor. The Chart.Export VBA command exports a chart to a variety of bitmap file formats. This varies from machine to machine, but three that I’ve always found are. This command allows you to export your chart in any of the bitmap formats that you have the appropriate export filters for. Excel doesn’t offer this as a native feature in the UI, but you can export a chart using VBA: ActiveChart.Export 'C:\My Charts\SpecialChart.png' Often people want to save their charts as an image file.