Thursday, June 27, 2019

E&T - Photoshop Elements Sky Replacement


This is the second of a possible series of Education and Training (E&T) modules for the OPC.  The modules will include an artistic goal, a technical goal, detailed instructions and image files.  All modules are anticipated to be in the form of a PDF with links to image files stored on a cloud service.  

The artistic goal of this module is to replace a bland sky with a more attractive sky.  The technical goals are to become familiar with more advanced PSE features (adjustment layers and editing tools) and to identify challenges involved with editing photos (image pairing and mask complexity). 

Thursday, May 23, 2019

E&T - Photoshop Elements Layers and Masks


This is the first of a possible series of Education and Training (E&T) modules for the OPC.  The modules will include an artistic goal, a technical goal, detailed instructions and image files.  All modules are anticipated to be in the form of a PDF with links to image files stored on a cloud service.  

The artistic goal of this module is to embed the image of a flower from one file into a reflection in a second file.  The technical goal is to become familiar with the user interface of Photoshop Elements (PSE), some of its basic features (opening and saving files), and some advanced features (layers and masks).  


Saturday, September 30, 2017

Solar Eclipse, 20170821


Kudos to the editorial skills of one the club’s best photographers, John N., for drafting the following for the OLLI E-News:

“Photo Club Members Record Exciting Events

“Recently, members of the OLLI Photo Club clicked away to photograph the August 21 eclipse of the sun and showed their results at the August Photo Club meeting.

“George B. and Hillary R. traveled down to South Carolina to witness and record this amazing event. “I was in Anderson, SC, in the parking lot of my hotel with many other people,” said George who had cameras on tripods to record the event. “This was absolutely spectacular,” he said, and his pictures reveal the detail of the amazing event.

“Hillary and her family were in Lexington, SC. Just before, during and after totality, she pointed her camera and clicked away. Her picture of “the diamond ring” when the sun just begins to reappear is breath-taking. Here’s what she said about experiencing the eclipse:

“At 1:30 we put on our "sun" glasses and began watching the moon creep over the sun, slowly heading from east to west forming crescents as it crawled onwards. After 25 minutes, just as the moon approached the last curve, the sun flashed a bright orange "C", its final farewell. At the same time, on the eastern curve, a dazzling burst, a diamond ring, blazed with a rainbow prism, and lit up the sky. THEN IT HAPPENED! It was the longest two minutes and the shortest two minutes. The light switched off. And the world was navy blue. And it was still. And it was quiet. And it was cool. And it was soft. And we looked up.”

 -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
What a wonderful description! Not only does Hillary keep a poet’s pen in her desk, she has shared with us a most expressive, rhythmic and focused story, perfectly matching the experience. Now, for adventurous souls, comes my mundane, chaotic and wordy blog… in the following PDF files:

Unexpurgated geeky version of blog:
https://1drv.ms/b/s!AqMo42Yo9nXygY0GeO4fDl-cHq6mwQ

Partially expurgated, somewhat non-geeky version of blog:
https://1drv.ms/b/s!AqMo42Yo9nXygY0FPNnfQzSS1J4sVw

Gallery of my eclipse photos:
https://diversions.smugmug.com/Galleries/Galleries-by-Subject/Astrophotography/Solar-Eclipse-20170821

Sunday, September 10, 2017

Solar Funnel Imager

Preparing for the 2017 solar eclipse requires purchase of a few items: solar glasses, solar filters for all camera lenses, and, for the adventurous, a solar funnel imager.  A “funnel?”  Yes, a funnel, the kind that Home Depot carries.  If you already have a telescope, you might be able to build an imager large enough for a half dozen friends to view the partial eclipse phases at the same time.  You will also be able to see sunspots, at least the larger ones.

The gallery has a link to the NASA site containing instructions for building your own funnel imager.

Solar Funnel Imager Gallery – July 28, 2017: 

https://diversions.smugmug.com/Galleries/Galleries-by-Subject/Astrophotography/Astrophotograpy-Equipment/


Sunday, July 23, 2017

International Space Station


Another local overflight of the International Space Station (ISS) gave me the opportunity to refine the exposure for the photoshoot following last year’s attempt.  The photos were taken handheld on a Canon 70D at 600mm (960mm equivalent) with a 1/800, f/7.1 exposure at ISO 1600.  I experimented a bit with exposure but quickly returned to the planned exposure.  

More important than the camera’s technical settings is a comfortable chair in which one can lie back with at least one elbow supported on an arm rest while panning the quickly moving station.  My chair was the low-slung collapsible kind one sees at lawn concerts. 

The other main trick of the trade includes focusing at infinity.  For this I arrived a half hour before the appointed appearance of the ISS, placed the camera on a tripod and focused upon Jupiter, making it as crisp as possible.  The image of Jupiter below is a 100% crop from the Lightroom loupe, zoomed to 11:1.  Obviously, I did not see this in the camera’s LCD panel, I only saw a small disk which I made as small as possible with the focusing ring.  To ensure that the zoom and focusing rings did not “drift” during the shoot, I taped them down with painter’s tape which does not leave an adhesive residue upon removal. 



The panning was done with Raw files – I did not follow my own guidelines, I should have used JPEGs to increase the camera’s burst rate.  Well... that’s life.  Between bursts I tried keeping the ISS in the viewfinder so I wouldn’t have to spend precious seconds re-aiming the camera.  When near the horizon, approaching or receding from the camera, the ISS image is faint, increasing the difficulty of aiming the camera.  After the shoot came post-production: selecting the best of 300 shots, cropping, resizing and arranging them in the gallery. 

The image below has been resized, eliminating the view of pixels as seen In the Jupiter image and smoothing the color gradation from pixel to pixel.  The original ISS image is about 40 pixels wide; for comparison, the image of Jupiter above is about 30 pixels across. 

Enjoy! 

Tuesday, January 24, 2017

Critiquing Photographs (Revised)

Revised 2018.01.22 to add link to Wikipedia article listing design elements.
Revised 2018.02.26 to add a view of the Three Step Method in context.

How does one evaluate photos submitted for the OPC’s monthly competitions?  Or how do we evaluate our own photos?  Well, a good start would be to follow the techniques of a trained photography judge.  Now most of us don’t have that training and experience, but by attending the 4th Friday discussions and reading the comments in the competition galleries, we can start absorbing the techniques demonstrated by some of the OPC’s luminaries. 

Their critiques often begin with identification of the photograph’s subject, and then move to a description of the photograph’s elements of design and principles of composition.  We all can practice their technique by (re)-familiarizing ourselves with the “vocabulary” of elements and principles of visual design.  Freeman Patterson is one of the first photographers to publish a description of these elements and principles.* 

So, to foster our understanding of visual design, I would like to suggest a Three Step Method** to approach photographic criticism. 

1. Impression.  Determine what the photo is about, that is, its subject and the impression the photo makes upon the viewer. 

2. Technique.  Identify the techniques of craft employed in the photo, that is, the elements and principles of visual design from Freeman Patterson, and their equivalent from other photographers.  Patterson’s basic elements of design are color and tone and his basic principle is dynamic simplicity.  See Photography Course, Vocabulary of Criticism for a list of the secondary concepts derived from these basic elements and principles.   

3. Assessment.  Assess whether the "techniques" support the "impression."  For example, if a photograph leaves the viewer with an impression of motion, identify what elements and principles convey that impression of motion.  Then determine whether other elements or principles might convey the impression differently, more perceptibly, more subtly, etc.   

This critiquing method doesn't consider the craft of camera usage, such as holding the camera steadily, achieving a useful exposure, setting an appropriate white balance, etc.  But the method does not preclude discussion of camera usage to improve the photographer’s visual design technique.

May I suggest we try out this method at our next 4th Friday meeting?  And…

... Have fun!


* Note that many photographers have devised their own elements as exemplified in Wikipedia (a handy, practical reference for all things photographic), but there is significant overlap with Patterson’s elements.  And I think his elements hold up well as the fundamental elements upon which to base principles and to establish assessment methods.  See Wikipedia’s article “Composition (visual arts)” for a listing of many elements of design. 

** See Photo Critiquing Approaches for a view of the Three Step Method in context.

Saturday, October 15, 2016

Antares Launch from Wallops, Photo Op (Revised)


Antares Launch Viewed from Fairfax
Each track segment is a 15 second exposure at f/3.5, 50mm, ISO 100.
The large gap near the top is Antares coasting after first stage cutoff.

Revised 2016.10.20 to describe photo and to replace unfinished photo by final.

  • A total of 19 track segments comprise this image, including two blank segments during which Antares is coasting after first stage cutoff.   
  •          Cutoff occurred near the apparent peak of the trajectory.  About ¾ seconds after cutoff is a dimmer light lasting about 2 seconds, perhaps related to separation of the 1st and 2nd stages.
  • Second stage ignition occurred after the blank segment.  The first seconds of ignition appear brighter than the rest of the segment.   
  • The rocket rises high enough above the horizon that an observer in Fairfax does not require a clear view of the horizon to see most of the trajectory.   
  • A diagram of key launch events is available from http://spaceflightnow.com/2016/10/17/key-events-during-the-antares-rockets-climb-to-orbit/, courtesy of Orbital ATK.  

Revised 2016.10.17 AM to note the launch delay and 2016.10.17 PM to add image.

From the Antares "Launch Status" Blog: "Today’s launch of Orbital ATK’s Antares rocket is postponed  24 hours  due to a ground support equipment (GSE) cable that did not perform as expected during the pre-launch check out. We have spares on hand and rework procedures are in process. The Antares and Cygnus teams are not currently working any technical issues with the rocket or the spacecraft. The launch is now scheduled for October 17 at 7:40 p.m. EDT.

Revised 2016.10.16 to include references for future launch photography.

Depending upon whether we have clear skies, the nighttime launch of the Antares rocket from Wallops Island will be visible from Fairfax.  A view of the horizon is possible from a spot at the Pickett Shopping Center in Fairfax City, behind the Fedex on the delivery ramp, looking southeast over Route 236 heading toward Annandale.  The earliest launch time is this Sunday at 8:03 pm.

Original Post 2016.10.15

Attached is a photo taken three years ago with a point-and-shoot from the Fedex location of another launch from Wallops, a composite of 15-second exposures with a 15-second, noise-reducing dark screen between each exposure.  This launch was in an easterly direction, hence the rocket appears to be traveling right to left.  Today’s Antares launch will be in a southeasterly direction, so, since Wallops is southeast of us, the rocket may appear to be traveling almost straight up.

Visibility Map and Other Details
(Be aware of the mouse-over ads embedded in the double-underscored text of this site.)
http://www.space.com/34348-nighttime-private-rocket-launch-east-coast-visibility.html

Launch Status
http://www.nasa.gov/centers/wallops/home

Cloud Maps
Weather Underground WunderMap: https://www.wunderground.com/wundermap
Clear Sky Chart: http://www.cleardarksky.com/c/WashingtonDCkey.html

General Information
http://www.space.com


No Longer Available:
Infrared Satellite: https://www.wunderground.com/maps/us/IRSatellite.html
Visible Satellite: https://www.wunderground.com/maps/us/VisSatellite.html
Visibility: https://www.wunderground.com/maps/us/Visibility.htm
Zoom Satellite: https://www.wunderground.com/satellite/vis/1k/US.html




LADEE Launch from Wallops, Viewed from Fairfax, 2013.09.06



"Zoom Satellite" Image



LADEE Flight Path Viewed from The Lincoln Memorial