Comments for Stack Exchange Photography Blog

Comment on Using Photoshop’s Calculations tool for black and white conversion by Paul Sophocleous

Paul Sophocleous — Thu, 01 Dec 2016 09:08:25 +0000

This technique does not create a black and white image, it creates a selection. If you look in your channels palette, you will see it as Alpha 1. When you look at the black and white image, you are looking at just the individual channel, not the RGB image.

To create a black and white image that you can save, create a new layer at the top of your layer stack, and fill it with black. The go to the Select menu, choose load selection, and choose Alpha 1 (or whatever your alpha channel is called. With the selection active, fill it with white. Now you have a layer that has your black and white image on it.

Comment on Using Photoshop’s Calculations tool for black and white conversion by mike

mike — Wed, 28 Oct 2015 23:39:51 +0000

same trouble here - how to save it? The background is still in colour

Comment on Take macro shots like this for less than the cost of a pizza by james

james — Sun, 02 Aug 2015 13:31:33 +0000

Great blog!

Comment on The True Quality of Top-Shelf Glass – A Birder’s Perspective by Foto Nunta Brasov

Foto Nunta Brasov — Tue, 17 Mar 2015 10:02:12 +0000

I agree with you, nothing compares when you hold a lens like the Canon EF 300mm f/2.8 L II IS in your hands. I've tried it and it is spectacular!

Comment on The Realities of Resolution by Lukas

Lukas — Tue, 27 Jan 2015 19:31:58 +0000

Nice article, for curious I will add that nowadays you can go around light diffraction limit in optical system if you do fluorescence imaging of your object, you shine strong (laser) light on it and detect another light coming out from it with boosted CCD sensors for example. If you hook up such sensor to a microscope with a fancy lens (objective) you can even resolve neighboring objects within your diffraction limited light spot! If you focus at one such object (another one has to be turned off for now!) you will see its regular diffraction limited image on the sensor, i.e. again light spot spread over a few pixels in each dimension. However, if you fit light intensity of pixels holding this spot image with a special mathematical function you will get a center of the object with accuracy of a few nanometers only. After you imaged first object (that is turned off now) you can turn on the second object and do the same - this effectively means you can resolve two such objects if they are only tens of nanometers apart. The trick here is you need to be able to measure only one object at a time, one by one, you read all the light from first excited object (fluorescence light finally runs out) and then you go onto another object, etc... After you read fluorescence light from all the objects (one at a time) you can overlay and render the final image with all the objects resolved at just tens of nanometer resolution. This year’s Nobel Prize in Chemistry was awarded for this technique, also called supperresolution or PALM/STORM.

Comment on The True Quality of Top-Shelf Glass – A Birder’s Perspective by Sandy

Sandy — Mon, 12 Jan 2015 14:50:20 +0000

I have a 300mm zoom lens, and I'm thinking about getting a 400mm, but I'm wondering if it's worth the cost. Could you send me side-by-side photos...one taken with a 300mm lens and the other with a 400mm lens, so that I can compare the difference? Thank you.

Comment on Portrait perspective by piotrga

piotrga — Mon, 20 Oct 2014 10:19:23 +0000

First of all I appreciate the effort.

The difference in the light as well as model position and also you've taken some photos from the eye level, some from below EL and some from above. All these affect the photos and to be frank I don't see the distinctive difference apart from maybe 18-35mm. But this can be due to all the factors I mentioned.

Comment on Karl Oskar Days 2010 19 by Sharon

Sharon — Wed, 03 Sep 2014 21:12:19 +0000

Excellent website yyou have heere but I was wanting to know if you knew of any forums that cover the same topics talked about in this article? I'd really love to be a part off group where I can geet opinions from other experienced people that share the same interest.

If you have any recommendations, please let me know. Many thanks!

Comment on Using Photoshop’s Calculations tool for black and white conversion by shelly

shelly — Sat, 28 Jun 2014 17:05:38 +0000

How to save it... When I save the image I got the same pic not b&w

Comment on Lightroom Fundamentals by Nicole

Nicole — Thu, 24 Oct 2013 11:57:23 +0000

I appreciated the in-depth look. 3 bullet points may be "web writing" but those with short attention spans, but it doesn't convey much useful information.