Hi Arul,
Thank you for contacting Aspose support.
The referenced article uses the Jpeg’s EXIF & JFIF segments to extract the thumbnail images, because in Jpeg image format, the thumbnails are stored inside the image using the EXIF and/or JFIF segments. In case you wish to create thumbnails from other image formats such as PNG, BMP & TIF, we would suggest you to use the Image.Resize method and save the result as a new image. For further elaboration, please check the detailed article on Resizing Images.
Please feel free to write back in case you need our further assistance.
Hi Arul,