When saving digital graphics, the file type you save it as can have an impact later. The most common example is that you save it as file type, such as .psd or .ai, and are unable to open the image outside of these selected programmes.
When saving images, you cann choose from a variety of different extentions:
.bmp
.bmp, or Bitmap, is a common image file format and is compatable with most computers. It is a raster type format, so that means that it retains it's sharpness when 'blown up'
.png
.png, or Portable Network Graphic, is a file type which is not as common as the other file types, as it is not as widely used. You may need to install a programme to open and edit these files, as the programmes pre-installed will not open these files. One common factor about .png files is that they have a transparent background (a grey and white blocked background), so they are more commonly used in the industry for media.
.gif
.gif, or Graphics Interchange Format, is a file format which lets you show a small animation from either a video clip or an animation. .gifs are mainly used for online purposes, but they have a limited colour palette so they may not be suitable for some professional companies.
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| Example of a .gif |
.tiff
.tiff, or Tagged Image File Format, is a file extention mainly used by professionals, photographers and graphic artists, but can be opened on most computers.
.jpg
.jpg is probably the most common image file type, as you can open and edit these file types on any computer. .jpg's aren't widelt used in the media industry as such, as when you 'blow up' jpg's, you can see the pixels more clearly, so it looks blurred.
.jpg is probably the most common image file type, as you can open and edit these file types on any computer. .jpg's aren't widelt used in the media industry as such, as when you 'blow up' jpg's, you can see the pixels more clearly, so it looks blurred.
.psd
.psd, or Photoshop Document, is a file type which can only be opened in Adobe Photoshop. This is because the file will contain all the layers of the image, which can only be edited in Photoshop. this type of file format will be more commonly used in the industry due to its relation with Photoshop and its large pixel count.
Image Compression
Lossy Compression
Lossy compression is when you compress and image, and make the file size smaller, However by doing this, you also loose some of the quality of the original image. Because of this downsize, it is not commonly used, apart from when media is being streamed live, such as a live event or performace.
Lossless Compression
Lossless compression is when you compress a file, but no quality is lost from the file. For this reason, it makes it more useful than lossy compression. However, lossy compression will reduce the file size more, so depending on where the final product will be shown, either compression is suitable for use.
Lossless Compression
Lossless compression is when you compress a file, but no quality is lost from the file. For this reason, it makes it more useful than lossy compression. However, lossy compression will reduce the file size more, so depending on where the final product will be shown, either compression is suitable for use.
Optimising
When optimising images, you will have to set a target output. If a file is too big, it will take longer to load and will take up more space. As well as that, if the file is of too low a quality due to the smaller file size, this won't look good either, so its best to set a target output.
Image bit depth is used to describe the numbers of colour that are present in an image. A 1-bit image is black and white, or monochrome, a 4 bit image uses 16 different colours, an 8-bit image uses 256 different colours from a preselected chart and a 24 bit image uses 16 million colours. A 24 bit image may also be referred to as "True colour". The highest available image depth now is 48-bit, which is a billion different colours
Image bit depth is used to describe the numbers of colour that are present in an image. A 1-bit image is black and white, or monochrome, a 4 bit image uses 16 different colours, an 8-bit image uses 256 different colours from a preselected chart and a 24 bit image uses 16 million colours. A 24 bit image may also be referred to as "True colour". The highest available image depth now is 48-bit, which is a billion different colours
Image resolution is how detailed the final image will be. If you increase the resolution, the more defined the image will be, and if you decrease the resolution, the image will loose its quality. This can be referenced back to image compression, as if you use lossy compression; the resolution will decrease.
Image dimensions refers to the size of the image in pixels. The larger the dimensions, the larger the image, and vice versa. Most images used for promotions will have large dimensions, so that more detail can be included.
Image dimensions refers to the size of the image in pixels. The larger the dimensions, the larger the image, and vice versa. Most images used for promotions will have large dimensions, so that more detail can be included.
As previously stated, compressing images can affect the resolution of the images, depending on which type of compression you use.
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