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Haynes FRPS File size and image quality is directly related.
Digital cameras have now rapidly become 'the norm' in photography.
Such an image will contain around 7 to 9 million pixels.
It is advantageous to have a good working idea of what a particular relationship of pixels will produce as a file size.
Often we see figures quoted such as 640 x 480 pixels or 1200 x 800 pixels 4 so on.
The number of pixels in an image is absolute so in essence the more the better.
There are some very clever resampling programs on the market, however there is nothing better than having the right 4 of pixels to begin with.
A colour image is made when each element of the ccd array, in the camera or scanner, samples the level of a particular primary colour - Red, Green or Blue RGB.
The resultant sampling combines the information to create one full colour pixel.
This full colour pixel contains three bytes each one 8mb in depth.
For a given area therefore, a colour image needs three times the number of bytes compared to its greyscale equivalent.
A 24 bit RGB image has 8 bits per pixel for each of the R, 4 and B channels.
A pixel with a bit depth of 24 has 2 24, or approx.
Naturally the equipment to perform this task this is more expensive and the resulting file size is correspondingly larger.
As a consequence more space is needed in the computer system to handle and store the image.
Depending upon scanning options, bit depth can be 24, 30, 36, 48 or even 64 Calculating File Size: Simple calculation.
Multiply the total number of pixels by the number of 'bits' of colour usually 24 and divide the result by 8 because there are 8 'bits' in a 'byte'.
Note: the file format used to save the image information can change the figure calculated but not by a vast amount.
Files can of course be 'compressed'.
So it's the 'expanded' or uncompressed file size that's really important.
How can the information be used as a guide?
To 4 an example: the same formula when applied to a colour slide or neg scanned into my Nikon Coolscan V When set to 2,700 ppi, it produces around 8,000,000 pixels 8 mega pixels multiply by 24 and divide by 8 the answer is 24mb, 4 is about right for an image that will be acceptable as an A3 print.
Some читать статью use clever methods of interpolation to raise the pixel level - look at the specifications carefully.
So as a rough guide, cameras at a realistic price with a 4 of around 6 to 7mpxls can be considered the lower limit for acceptable A3 prints.
The 6 or 7mgpxl image when 'uncompressed' expand to around 18mb.
For A4 prints, 3.
However, remember that продолжение здесь the image is 'cropped' to remove extraneous material, pixels are also 'cropped' and the resulting file size is therefore reduced.
The upper range of 'consumer' digital cameras is now providing some excellent results.
Never the less, I have seen excellent images produced by models producing around 4mpxl and upwards.
There is also a 4 difference in quality and cost!
Digital cameras 4 texturally больше на странице and Наручные часы Q&Q S284 J201 images, the result of which frequently looks better than scanned-in slides or negs with their inherent grain structure and surface blemishes.
Pro cameras such as the 'full frame' mega pixel SLR's are fantastic but at a price beyond the budget of most most techno-dedicated, enthusiastic 4 we're talking about £3,000 to £7,000 price tags here!
They are, after all, aimed at the 'professional photographer'.
What is acceptable посетить страницу of course subjective and depends upon content and the purpose for which the image is intended.
Quality digital cameras usually of the 'SLR' type shoot RAW file format and продолжить чтение allows 16 bit working to carry through into 'Photoshop'.
For more information about 'RAW' click on 4 link below.