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Beyond editing and optimization
Let's talk a little bit about "what is optimization?,"
File type, resolution, color depth, and file size,
Which file type to use,
And tips to manage files.
Optimization is the process of reducing the file size while maintaining the best possible quality,
see other video for 'how to' optimize.
File type, resolution, color depth, file size:
this chart illustrates the strengths and weaknesses
of the file typess we've been discussing.
BMP typically is low resolution, set to the monitor, 72 to 96 dots per inch...
it is capable of going up to 16.7 million colors
2 to the 24th, or 24 bit,
but as it is a large file
not compressible, it is not web suited.
GIF
resolution varies, but typically it's low;
you can have up to 256 colors or 2 to the eight;
that makes it small and suitable for web use; don't forget we can also animate or have transparency
in GIF.
TIFF: while the resolution varies, it can go high.
It is capable of true color,
up to 16 million,
and beyond.
But it turns out to be a large file,
not suitable for web use; it's also not as consistent as I would choose
for a standard to be.
So I typically use PNG for my original files.
Resolution varies but it can go to high resolution.
You can choose a 2 to the eight, or 2 to the 24 bit capacity, that is 256 colors up to 16 millions and beyond.
It is suitable for web use, but the files tend to be larger... but these are great file formats for
photographs; anytime you want to print something
PNG is probably going to be your best option.
JPEG
JPEG stands for joint photographic experts group,
so you see right there that its best used for photographs.
Resolution varies, it can go very high
but optimization often lowers the resolution,
making it not suitable for printing.
It is capable of going to 16.7 million colors, 24 bit,
but again the color depth can be changed during optimization.
it is suited for the web, as we usually wind up with a low file size.
but these files are not suitable for printing, the resolution and color depth are just too low.
So, which file types to use?
If you need graphics, such as a chart,
if you need animation or transparency: GIF is your solution.
Just remember it is limited to 256 colors and is suitable for web use.
But always save your original photos as a 24 bit PNG.
That makes it suitable for printing, it doesn't go through an over compression process
where you lose information, each time you save the file.
An optimized JPEG is great for web delivery.
Just remember JPEG loses quality every time it is saved by an editor.
So PNGs for your original file types, jpegs for your web deliverables.
Tips to managing files.
Again start by converting your source file to a PNG.
This is a lossless format, the quality stays high.
You should have two versions after you edit your image:
First off, you are going to Save As a new PNG . Again, a high quality image suitable for printing.
Please make sure you don't replace your original file.
Then you are going to save the PNG as an optimize JPEG.
This is suitable for web delivery.
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