i will give the answer one day waiting for me...
With libbmp and libjpeg. STFW for details.
The extension is actually immaterial. It merely serves to give the operating system a hint as to the file's content, allowing the file to be associated with a particular application, such as a GIF file viewer or an image editor application. In order to save a GIF file, you must first re-encode the image (assuming it is not already in GIF format), and save the output to a file with a GIF extension.
save it
You can write it into a file as a floating-point value.
Right click the image, then click "save image as..." and save it under whatever file you want
Right click on the image if you are running windows. Click on the save as select where you want to save the image and click save
Right click on the image and click "Save image"
Just save it in format zou want, you can do that from File - Save , Save as, Save for Web and Devices
To save pictures from emails to your computer, you can simply right-click on the image in the email and select "Save image as." Choose a location on your computer to save the image, and then click "Save." Alternatively, you can drag and drop the image from the email directly onto your desktop or a folder on your computer.
All C++ source code is is a text file with the .cpp extension. So if you save your code as *****.cpp then it is automatically C++ source code.
right-click the image and then press "save image as..."
A long press of an image will give you the options box. Pick "Save image" and it will save into the Nexus 7's Gallery.