Unit 30, Task 8b - D2

Unit 30, Task 8b – D2

There is different types of file format that are used when saving an image. The type of file format depends on the specific image, and some images require different file formats because of the size of them. Bitmap is a file format that is used for larger images rather than smaller ones,  this is because bitmap stores every small pixel that is in the image which makes the image have good clarity, however the file size is bigger than a normal file as the size of the image.  Another file format is a GIF (Graphics interchange format). GIF is a type of Bitmap file however is mainly an animation.  The file size of the GIF’s is good as they stay at a reasonable size, this is because of the limit of colours that is allowed to be used, this allows the file to stay at a small size.  JPEG is another file format that is commonly used as it is used for pictures, taking pictures and for downloading images from the internet. When an image is saved as a JPEG the image can become pixelated when stretched which lowers the quality of the image. They go pixelated when the image is stretched to be bigger and the file can still stay small.

Compression techniques are when an image is compressed to have a lower file size. There is two different compression techniques, these include lossy compression and lossless compression. Lossy compression is when the compression of an image makes it pixelate in order to make the file smaller. This is because the file can be used more efficiently when it is at a lower size. This usually happens when video interactions, when they freeze it’s because its being compressed to make it smaller as it will run more efficiently. Lossless is when you compress the file and expect it to be the same as before. This is when the output is needed to be a better quality, this is usually used when a file is an important document such as a legal document.  However it can be adjusted for self-standard

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Image resolution is the number of pixels that a device can handle. Different devices can handle a different amount of pixels. The pixels are captured by height and length, and then multiplied together, this shows how many pixels a device can handle. The more pixels a device can handle the more clearly the images will be, and that is important as quality is what you use these devices for. However depending on the device depends on how you can save the images. If the device can handle a lot of pixels but has hardly any memory, then you will need a memory stick, or to make some more room. As the more the pixels the larger the file size.

Colour depth also known as bit depth is the number of bits used to indicate the colour of a single pixel.  Depending on the bits depends on how defined the colour is going to be. If there is more bits then more shades of colours can be produced, this will make the quality of an image higher, as the colour will be more defined then if there was less bits. The more the colour is defined and enhanced the larger the file will become due to the more pixels that it has to use for the colour depth.

The original photo on the left top corner is the high quality version of the photo. This means that the file size is larger than the rest of them because the colour depth is higher. The more colours the picture has means the more pixels it holds, this will create a large file. These high resolution photos are usually used for big posters and other large items requiring an image.

The Picture on the top right would be used for a book as it would be easier to print because the file size is smaller because it has less colors which reduces the size.

The picture in the bottom left would be used as a picture on a website because it hasn't been blown up and the pixels would smaller which means looking at it on a smaller screen wouldn't matter, as the quality would still be good as of the size of the file.

finally the image on the bottom right hand corner would be used as a thumbnail because it is used on websites such as Google and is uploaded in a very small file size, so when clicked on the bigger pictured is to be viewed.