If we save the image with the image processing program such as Adobe Photoshop or Microsoft Paint, then we can choose the appropriate image format via the menu File -> Save As and select the file type that we want. Especially for Adobe Photoshop, which have addition to a better with the menu File -> Save For Web. Than you can choose a picture, we can also set the compression and image quality. This is the following types of images are often used.

BMP (Bitmap)

BMP file type commonly used on the Windows operating system and OS / 2. Excess is the BMP file type can be opened by almost all image processing program. BMP files have a size much larger than the types of others.
BMP files suitable for:
* Desktop background in windows.
* As the image while the re-edited without lowering quality.

BMP file is not suitable for:
* Website or blog, need converted to JPG, GIF, or PNG.
* Stored in the disk/flash without the ZIP / rar, unless the space is not a problem for you.

JPG / JPEG (Joint Photographic Experts Group)

JPG file type is often used for web or blog. JPG files using a compression technique that causes the image quality down (lossy compression). Each time you save a JPG to the type of another type, image size is usually off, but the quality down and can not be restored again. BMP file size can go down until 1/10 when converted to JPG. Although with the decrease in image quality, in particular images (eg scenery), a decrease in image quality is almost not visible eyes.

JPG file suitable for:
* Picture that has many colors, such as facial images and scenes.
* Gradient image, for example, the color changes slowly from red to blue.

JPG file is not suitable for:
* Picture that only has a few colors such as cartoons or comics.
* Picture that require specificity as the logo.

GIF (Graphics Interchange Format)

GIF file type allows the addition of transparent colors and can be used to create a simple animation, but at this time only up to standard GIF 256 colors only. This file is not compressed using the data (lossles compression) but a decrease in the number of colors to be 256 often create an image of rich colors, such as a scene is not realistic. In the MS Paint program, there are no facilities used color adjustments (color table), so save GIF files in MS Paint often produce images that look broken or changed color. In the image processing program that is better, such as Adobe Photoshop, color table can be set automatically or manually so that the image does not change color or damage.

GIF files suitable for:

* Images with a few number of colors (under 256).
* Clear Picture that requires less difference in color with no logo.
* Simple animated images such as banner ads, banner, header.
* Print shoot, of the programs simple with a few number of colors.

GIF file is not suitable for:

* Picture that has many colors such as scenery.
* Picture in which there have a gradient colors.

PNG (Portable Network Graphics)

PNG file types is a powerful compression solution with more color (24 bit RGB + alpha). Unlike the JPG compression techniques that use the data to file using the PNG compression does not remove the data (lossles compression). The advantages of PNG file is the color and alpha transparency. Color alpha allows a transparent image, but the image still can be seen as the vague or clear. PNG files can be set the number of 64 bit color (true color + alpha) to 1 bit indexed color. With the same amount of color, PNG file compression is better than GIF, but it has a file size larger than JPG. Lack of type PNG is not popular so that most browsers do not support them.

PNG file suitable for:
* Picture that has many colors.
* Picture that would re-edited without lowering quality.

PNG file is not suitable for:
* If the image JPG has compressed with almost no visible decline in quality.


All image file types mentioned above (BMP, JPG, GIF, and PNG), including the type of Raster images (also called or Bitmap). Raster images consist of dots that the amount fixed pixels. If enlarged, the zoom-in or change the size of the image, the image will look broken or not as well as the original. The other type of image is the image vector. Vector image consists of lines, forms, fields, and color in the written instructions mathematically. If enlarged, the image quality remains vectors. Vector image processing applications such as CorelDraw (CDR) and Adobe Ilustrator (AI). Image vectors at this time can not be use on the web browser.

Hopefully useful.