Theory and Techniques

On this page, notes will be added to help your Photographic and Post Processing knowledge.

If you click on the blue title link the file will open the page for this file. If you then click on this link the file will then open the page on your computer (Microsoft Word 97 or later as long as that program is already on your computer).

Sunny 16 Rule.

Photographic theory.

Camera Exposure

Exposure

Diffraction-of-light

Reflection-of-light

Refraction-of-light

Post Processing.

Changing your Digital colour photographs into “Black and White” using Adobe Photoshop

AV production “Pictures to Exe” Bryan Crook.

Printing in Black and White

The-best-free-photo-editor-2016  

Resources. A list of useful resources provided by John White.

Organisations
Midland Counties Photographic Federation http://www.mcpf.co.uk/
The Photographic Alliance of Great Britain http://www.thepagb.org.uk/
The Royal Photographic Society http://www.rps.org/
British Photographic Exhibitions http://www.britishphotographicexhibitions.org.uk/
Photographic Society of America http://www.psa-photo.org/
United Press International http://www.upiphoto.com/
United Photographic Postfolios http://www.uppofgb.com/
FLICKR photo sharing site (This one belongs to John White)  http://www.flickr.com/photos/16292700@N06/
500px photo sharing site http://500px.com/
Photographers.
Susan Brown http://www.susanbrownphotography.co.uk/p549784943
Trevor Cotton http://trevorcottonphotography.com/index.html
BW Vision http://www.bwvision.com/
Resources
Google Maps https://maps.google.co.uk/
Bing Maps http://www.bing.com/maps/
Ephemeris http://www.photoephemeris.com
Tides http://www.tidetimes.org.uk/
http://www.tides4fishing.com/uk/england/fleetwood
Photographers Resource http://www.photographers-resource.co.uk/

Photoshop
Julianne Kost http://jkost.com/
Russell Brown http://russellbrown.com/tips_tech.html

OTHER
Cameras – DP Review http://www.dpreview.com/
Nikon Digitutor http://www.nikondigitutor.com/index_eng.html
Canon Tutorials http://www.canon.co.uk/youconnect_newsletter/tutorials/
Printing DSCL http://www.dscolourlabs.co.uk/
Photo Library ALAMY http://www.alamy.com/
Getty http://www.gettyimages.co.uk/

USING STATISTICS IN PHOTOSHOP

Three kinds Of lies.

There are three kinds of Lies.

Lies, damned lies & statistics.

The phrase was popularised in the United States by Mark Twain (among others), in the 1900s when commenting on the abuse of statistics in the manipulation of public opinion. He originally attributed it to the British Prime Minister Benjamin Disraeli:

There is now a fourth – Photoshop Statistics.

In Photoshop we are going to use Stack Mode & Statistics. This part of Photoshop is more commonly used for Forensics, Medical and Astro-photographic use.

To get rid of people in photos it can be done in RAW or JPEG. It’s a 2-stage technique, one in the camera, one in Photoshop. Take about a dozen images about 20 seconds apart, preferably on a tripod, but it can be done handheld. If the light is changeable, turn off auto white balance, set it to the correct white balance.

Use aperture priority, set aperture, f8 should be OK.

Pick a spot to Manual Focus on -which includes all the scene…

Take pictures.

Put the images in their own folder.

Before going to statistics, we can adjust the images collectively in Bridge or Lightroom.

In Bridge, select all the images, double click in one of them, to open them all in Camera RAW.

In top LH corner drop-down menu > Select All. Make any adjustments in Camera RAW i.e. exposure, contrast, lightening, lifting shadows, clarity etc. It will make the same adjustments to all images, Then click DONE (not OPEN IMAGES).

Check back in Bridge & you will see all the images have been adjusted.

Open Photoshop. Go to… File > Scripts > Statistics

This dialogue box has a Stack Mode – chose MEDIAN (this is the important choice no other one will do)

Then go to USE & chose the folder, the Browse for the folder, the files in that folder will then be loaded.

Make sure that the box “Attempt to automatically align source images” is ticked.

Click OK.

Photoshop will then load the images into the Layers palette, align them & then apply the MEDIAN stack mode, & converted it to one layer as a Smart Object. Clicking on the down arrow on that layer confirms that the MEDIAN stack mode has been used.

With luck, all the people will have disappeared.

Note; it is still a RAW file.

You will note that because the clouds were moving when I took the pictures, the sky has come out a bit weird. So, we need to replace this weird sky with the sky from one of the original pictures. To do this we need to open the original pictures, but in register. We do this by double-clicking on the layer thumbnail & it opens a new psb file which contains all the individual layers.

Look through them to find one with the best sky.

Make a selection using the rectangular marquee tool including all the sky.

Edit > Copy Merged.

Go back to your RAW (or JPEG) file, the one that has the median stack mode.

Edit > Paste Special > Paste in Place…

He presto the selected sky appears in a new layer exactly in register with the new RAW file.

If you want to you can select one person to put back in your new picture using the same commands as above but using, say the Polygonal Lasso Tool & Hey Presto he appears on a new layer, exactly in register.

You can watch this tutorial on the following YouTube link.

Show St Peters 2.  Note the reflections also disappear.  It also works with moving cars.

John White October 2018

 

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