Image Resolution – Scanning and Printing

Image Resolution - Scanning and Printing

Many people shy away from doing the maths, but a very little arithmetic goes a long way – honestly!! It’s well worth taking the trouble to understand the effect that resolution has on file size. The tutorial contains the absolute minimum of arithmetic you need to get the best out of your scanner and printer. Scanning from a print 

Why scan from a print? The disadvantage is that some of the information in the original negative or slide has already been lost at the printing process. But sometimes the negative or slide is not available – such as when you want to carry out restoration work on an old photograph – in this case scanning from a print is the only option.

A flatbed scanner typically has an advertised resolution of “600 x 1200” or “1200 x 2400” or “2400 x4800” pixels per inch. In each case use the lower of the two figures when selecting the scanning resolution in the TWAIN dialogue box. The lower figure is the “optical resolution” of your scanner. (The scanner specification will probably quote up to something like 9600 ppi or more interpolated resolution. 

Interpolation is a mathematical process where the extra pixels are estimated from the values of surrounding pixels. This has the effect of slightly degrading the image and does not give any real improvement. If you do have to interpolate, use Photoshop, which will probably make a better job of it.)

Print Longevity – the care of inkjet prints

Print Longevity

Prints that are kept in archival boxes, in the dark, in low humidity and cool temperatures will last the longest, but let’s face it, we want to enjoy looking at our prints, so many of us will wish to frame and hang them. 

If a few simple precautions are observed, inkjet (giclée) prints can last for many years. By understanding some of the processes which can damage our prints, we can take the necessary measures to avoid them as far as possible.

A summary of some of the things that affect print longevity:
  • Contact with chemical vapours or materials – this includes airborne contaminants, such as spray furniture polish and cigarette smoke and also materials in direct contact with the print such as mounting glues, mounting card and contamination from fingerprints. It is always preferable to use museum quality mounting card wherever possible. At the very least, make sure that the mounting board you are buying is pH balanced; prints suspended in window mounts by tape hinges along the top edge should last longer than prints that are glued down;
  • Temperature and moisture. High temperatures will reduce print life. Avoid hanging pictures in the bathroom or kitchen unless they are well protected from moisture in the air; 
  • Light (more is bad, direct sunlight that also heats the image is worse). UV light is worst of all, and so special UV-filtering glass may be used in your picture frame (at an increased cost, of course). Always hang framed prints out of direct sunlight;
  • Ozone in the air;
  • The use of four or six colour inksets – six-colour inksets contain light magenta and light cyan inks; some manufacturers’ light cyan and light magenta inks have been shown to fade faster than the other colours;
  • Dyes or pigments. The keeping qualities of pigment inks are many times greater than dye inks;
  • The mixing of different inks on the paper, potentially resulting in interaction between them e.g. using a different manufacture of black and colour ink cartridges (more typically associated with dye inks, as pigments tend towards being inert anyhow);
  • Mould – there is an increased risk in more humid and warm conditions; 
  • Paper finish – photographs on gloss finish papers do not last as long as prints on matte papers in general. There are a few papers, such as Epson “Colorlife” paper, which has a semi-gloss finish and which has relatively good keeping qualities under glass. I have found that some of the textured matte finished art papers are lasting very well indeed under display conditions;
  • Inks on an inappropriate paper type; the ink manufacturers own paper products will generally give longer lasting results than compatible papers – certainly the longevity figures quoted by ink manufacturers relate to their own papers

the photographer

the photographer

Here we have a collection of 10 photographers that will scale to great heights to capture that perfect images – some quite literally. See the last one, you will see what I mean. Sometimes the difference from a good image and a great image is what the photographer themselves is willing to do.

Check these images out, you will see what we mean.

For me the kid taking a picture of the mountain biker is my favourite. He is prepared to get up real close and take the consequences!

Would you do the same?

Add some pictures in the comments of you going the extra mile for that perfect shot!

Black Friday/Cyber Monday Camera and Photo Deals

Black Friday/Cyber Monday Camera and Photo Deals

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