what is the difference between bitmap, jpg, git, and all the other extensions?

Question

what is the best to use on uploaded fotos to prevent them from being downloaded and used?

Answer 1

bitmaps and gif's are much larger and use more disk space...no matter the format, that won't prevent the image from being downloaded...the best possible avenue is to deny public access to your photo albums because all anyone has to do is right click and select 'save as' and they have your pic...i'm not a guru but that's the best i can offer...you may want to do a search for software that may prevent downloading...

Answer 2

They are different types of compression. For example, jpg press the color information, which makes the file size smaller. There is not a lot of ways to prevent pictures from downloaded. You can make the photo resolution as low as possible or put watermarks on them. But that's about all you can do.

Answer 3

A raster graphics image, digital image, or bitmap, is a data file or structure representing a generally rectangular grid of pixels, or points of color, on a computer monitor, paper, or other display device. The color of each pixel is individually defined; images in the RGB color space, for instance, often consist of colored pixels defined by three bytes—one byte each for red, green and blue. Less colorful images require less information per pixel; an image with only black and white pixels requires only a single bit for each pixel. Raster graphics are distinguished from vector graphics in that vector graphics represent an image through the use of geometric objects such as curves and polygons.

In computing, JPEG (pronounced JAY-peg) is a commonly used standard method of lossy compression for photographic images. The file format which employs this compression is commonly also called JPEG; the most common file extensions for this format are .jpeg, .jfif, .jpg, .JPG, or .JPE although .jpg is the most common on all platforms.

JPEG itself specifies only how an image is transformed into a stream of bytes, but not how those bytes are encapsulated in any particular storage medium. A further standard, created by the Independent JPEG Group, called JFIF (JPEG File Interchange Format) specifies how to produce a file suitable for computer storage and transmission (such as over the Internet) from a JPEG stream. In common usage, when one speaks of a "JPEG file" one generally means a JFIF file, or sometimes an Exif JPEG file. There are, however, other JPEG-based file formats, such as JNG, and the TIFF format can carry JPEG data as well.

GIF (Graphics Interchange Format) is a bitmap image format for pictures with up to 256 distinct colours from the over 16 million representable in 24 bit rgb. The format was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web. GIFs are compressed files, which reduces the amount of time it takes to transfer images over a network connection.

A GIF file employs lossless data compression so that the file size of an image may be reduced without degrading the visual quality, provided the image fits into 256 colours. (However, there is a hack that can overcome this limitation under certain circumstances; see True Color.) The GIF format's 256-colour limitation makes it unsuitable for photographs, though losslessly compressed photographs tend to be unacceptably large for the web anyway. On the other hand the lossy JPEG format does poorly on sharp transitions like those in diagrams or text, producing highly visible artifacts and little file-size reduction. Therefore GIF is normally used for diagrams, buttons, etc., that have a small number of colours, while the JPEG format is used for photographs.

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If you want to be sure your images are safe from being downloaded and used, the best option is to create a watermark over them. A watermark is a semitransparent name or image on the original works of art that displays your or your studio name. The way to do this is to open the item in photoshop
Select the text tool
Type your or your studio name onto the photo
Change the opacity to like 25% - 50%
Flatten the image
Save the image