Create Thumbnail from JPEG Images & Advanced Image Cropping in .NET Apps


Well-known member
Mar 10, 2010
Programming Experience
What is new in this release?

We are pleased to announce the new release of Aspose.Imaging for .NET 2.3.0. A thumbnail is a small copy of an image mostly used for recognition purposes when more images are stored in a library. Usually, when the image is shot with a digital camera, the thumbnail information is stored in the image metadata and can be retrieved through imaging libraries such as Aspose.Imaging for .NET API. With this release, Aspose.Imaging has provided a convenient mechanism to extract the thumbnail information from the image metadata. Aspose.Imaging now provides the long awaited feature of image cropping for the RasterImage class by introducing the Crop method. There are two overload versions of the Crop method available based on two different approaches as discussed below,

- Shift Mode: One of the overloads accepts 4 integer parameters denotes as Left, Right, Top and Bottom. Based on these values, the Crop method shrinks the image boundaries toward the center of the image while discarding everything outside the boundaries.
- Rectangle Mode: As the name suggests, this mechanism can be used to highlight a particular area by cutting it out of the image. The area should be defined using an instance of the Rectangle class and passed to the other overload of the Crop method.

Prior to Aspose.Imaging for .NET 2.3, the API facilitated exporting a specific layer of the AutoCAD DXF drawing to PDF format. With this release Aspose.Imaging adds another exciting feature that allows you to select a layout from a DXF drawing, and export it to PDF. The main new and improved features added in this release are listed below

- Add support for invisible objects
- Expose Jpeg features
- Add support for text rotation angle for dimension objects
- Request for Image Cropping Facility
- Publish PdfOptions.Layout property
- Dual sign the .Net assembly
- Fix bugs with damaged files during Cad->Pdf export
- Fix bug with changing of line width inside insert
- Fix bug with additional text for MTEXT entity
- Fix null reference exception during loading DXF file with old header
- ArgumentException: Parameter is not valid, at RotateFlip
- ImageLoadException: Malformed exif section at Image.Load
- Dithering algorithm sometimes produces animated gif-s with blinks due to wrong transparent color processing.
- Improve rendering of text entity
- JPG to TIFF conversion results in poor image quality.

Newly added documentation pages and articles

Some new tips and articles have now been added into Aspose.Imaging for .NET documentation that may guide you briefly how to use Aspose.Imaging for performing different tasks like the followings.

- Creating Thumbnails from JPEG Images
- Cropping Images

Overview: Aspose.Imaging for .NET

Aspose.Imaging for .NET is an image processing & manipulation component that allows developers to create, edit, draw or convert images in their .NET application. It allows developers to convert image files to PSD, BMP, JPEG, PNG, TIFF and GIF formats. Moreover a set of pens, brushes and fonts can be used to draw images or add new elements & text to existing images. Aspose.Imaging for .NET works well with both web & windows applications. Moreover, it adds the support for Silverlight platform.

More about Aspose.Imaging for .NET

- Homepage for Aspose.Imaging for .NET
- Download Aspose.Imaging for .NET
- Online documentation of Aspose.Email for .NET
- Demos of Aspose.Imaging for .NET

Contact Information

Aspose Pty Ltd
Suite 163, 79 Longueville Road
Lane Cove, NSW, 2066
Aspose - Your File Format Experts
Phone: 888.277.6734
Fax: 866.810.9465

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