Tom Axford

Lives in United Kingdom Midlands, United Kingdom
Joined on Aug 11, 2010

Tom Axford's recent activity

  • Don't worry!  You will not be overwhelmed by it around here.  :-)
  • JPEG file sizes are very sensitive to the JPEG quality setting, but also to the amount of fine detail in the file. This image has a file size of 5.1MB at 91% quality setting because it has lots of ...
  • Yes, they are different ways measuring how bright a pixel is, and are certainly not interchangeable.  However, each of them provides a measure of the brightness of a pixel independently of its ...
  • I'm sure that is true. However, I have been using GIMP for about ten years, primarily because it implements the HSV model of colour.  As I understand it, even the latest PS still doesn't have HSV. ...
  • Thanks for posting that.  It is not the same as what GIMP does, but similar in that it certainly doesn't preserve the colours accurately if the luminosity is higher than can be represented in RGB. ...
  • We are talking about somewhat different things. If you go increase the luminosity up to the maximum for all pixels, when you convert back to RGB (whatever colour space), the colours will often be ...
  • Unfortunately, the problem is more fundamental than that and changing the colour space doesn't solve it. It occurs because mathematically Lab colour has a much larger gamut than RGB.  However, the ...
  • Just to explain in more detail what I meant in my previous post: Take a colour like the purple shown below. In RGB it is (128, 0, 255), but its luminosity (L* in LAB colour) is only 39.3% (pure ...
  • That can work fine provided you keep the colour and luminosity separate. However, you have to eventually convert back to RGB to view your image.  The problem is that by working on colour and ...
  • I think you have probably realised that there is no ideal pair of binoculars.  Over many years, I have accumulated several pairs of binoculars from very small and light 10x25 to very big and heavy ...
  • I would partly agree with you.  My eyes are old enough that I cannot use the full light-gathering power of 7mm exit pupils, or even the 6mm exit pupils of my 7x42 binocs. However, there is another ...
  • Are the streaks along the length of the film strip or across it?
  • It depends on the camera.  I generally set the ISO to the recommended value for the camera I'm using and change it only if I cannot get an adequate exposure that will give me a good picture at ...
  • Nothing to do with focussing.  P mode chooses an aperture from the full range available on the lens and a shutter speed fast enough for hand-held shots, and the minimum ISO possible.  Different ...
  • If you don't want to control the aperture or shutter speed, but are happy to let the camera set both, then P mode can be quicker.
  • I think that 7x50 is generally recommended for marine binoculars because, not only are they the best in low light, but also the 7mm exit pupil makes them easier to keep in alignment with your eyes ...
  • Even though I have a full licence for Photoshop, I prefer to use GIMP as the processing that I like to do is a lot easier in GIMP.  PS simply doesn't have some of the tools that GIMP has.
  • Exposure is determined by aperture (f-number) whatever the camera.  So if you get the correct exposure at 1/250s, f/1.8, ISO 200 on your camera, those figures will also be correct for any size of ...
  • Just a suggestion - try holding the image in front of you and imagining that you are looking through a window at the scene beyond. It may help to shut one eye.
  • In any of the auto-exposure modes (P, A or S) the camera sets the exposure to the metered value, so no meter display is necessary.  In fully manual mode, the meter display tells you how much your ...
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Last post Aug 8, 2020
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