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Coloration in collared lizards

Friday, July 16th, 2010

Last week, I blogged about the huge variety of wildlife present in Joshua Tree National Park during the hot summer months.  Among my favorite animals in the park are the collared lizards, Crotaphytus bicinctores.  Collareds are aggressive, carnivorous lizards and are extremely flashy this time of of year.  They mate in late May-early July, and because of that, they have some fantastic colors.

male great basin collared lizard, joshua tree national Park california

Male Great Basin Collared Lizard, July 2010

The rich yellows and oranges on the legs, blue under the neck and black in the pelvic and pectoral areas are all characteristic of this species, and in my opinion, what makes it so beautiful.  The lizard above is a very accommodating male we found on the 49 Palms Oasis trail.  The females, however, are much less vibrant.

female great basin collared lizard, joshua tree national park california

Female Great Basin Collared Lizard, July 2010

Despite her more drab appearance, I still like the subtle hues present, especially the orange markings on the lateral sides of her body.  After the breeding season, these orange markings will fade, leaving the females a brownish color.  What do they mean?  While its long been known that animals change color, plumage, etc during their breeding season, a 2004 study published in the journal Herpetologica suggests that in female collared lizards, the orange markings signal to males that she is sexually receptive.  On average, orange female collared lizards were courted 5 times more frequently by males than non-orange females.

Its always important to remember that things that may just appear pretty (or sometimes, even ugly) to us very often have a function in nature.

Bighorn Sheep in Joshua Tree

Wednesday, July 14th, 2010

In my last post, I talked about some of the wildlife one can expect to find in the Mojave Desert on a hot summer day.  As it happens, that’s really only a small fraction of the diversity you’re bound to see.

After photographing birds, reptiles and insects, we headed over to my secret bighorn sheep location in hopes of finding at least one species of charismatic megafauna.  My spot did not disappoint: within about 20 minutes, I spotted a bighorn sheep ewe high on a rock, overlooking the landscape.

Desert bighorn sheep (ovis canadensis nelsoni) in joshua tree national park, california

The Sentinel, July 2010

The ewe let us walk closer to her, probably because (a) she had a good view of us, and (b) it was too hot for her to care.  Because of her cooperation, I was able to make closer images, especially using my friend’s 800mm lens.

Desert bighorn sheep (ovis canadensis nelsoni) in joshua tree national Park, california

Desert Bighorn Sheep, July 2010

After about 10 minutes, another sheep walked up to join the one we had been photographing.  I made a few more images, then left, so as to not stress them out too much–especially on a hot day!  To see all of my desert bighorn sheep images, click here.

Two desert bighorn sheep in joshua tree national park, california

The Sentinel's relief, July 2010

A visit to Joshua Tree, part 1

Monday, July 12th, 2010

Last week, a friend and I headed out to Joshua Tree National Park in search of summer wildlife.  There’s no doubt the desert is not a fun place in July–we started the first of three hikes in 80+ degree temperatures and ended up hiking in 100+ degrees, but it was a productive trip.

We started the day near the Black Rock Campground in hopes of finding Scott’s Orioles to photograph.  We did see several orioles, but they buzzed by at top speed, with no interest in stopping for us to photograph them.  Instead, we did find several very accommodating Ash-throated Flycatchers, and I got some nice shots of these pleasant birds.  To see all of my Ash-throated Flycatcher images, click here.

ash-throated flycatcher, joshua tree national park, california

Ash-throated Flycatcher, July 2010

After spending a couple of hours hiking in this area, we headed over to the 49 Palms Oasis trail, which is a fantastic place to photograph Chuckwallas and Collared Lizards.  We weren’t successful in finding many Chuckwallas, but we did find a few flashy and cooperative Collared Lizards.  These are some of my favorites, and I was very happy to find some that were so willing to let us photograph them.  To see all of my Collared Lizard images, click here.

great basin collared lizard, joshua tree national park, california

Great Basin Collared Lizard, July 2010

Great Basin Collared Lizard, joshua tree national park, california

Great Basin Collared Lizard, July 2010

When its over 100 degrees Fahrenheit outside, its easy to see why these heat-loving lizards would seek refuge in the bushes rather than the rocks–its much cooler!  Even in the upper photo, you can see the lizard’s toes lifted off the rock–presumably they stay cooler this way.

After these two very hot hikes, we headed into the main part of the park to look for antelope ground squirrels and dragonflies.  No squirrels were to be found, but we did find a scavenger-like scrub jay, as well as several dragonflies, including a new one for me: red saddlebags.

scrub jay, joshua tree national park, california

Western Scrub Jay, July 2010

Red Saddlebags, July 2010

In addition to this, we found several desert bighorn sheep (future post), and a few other cool things.  Despite the heat, it was a great day in our local National Park!

The evolution of an image, and the value of critique forums

Saturday, January 30th, 2010

Like any artist or hobbyist, photographers spend a lot of time learning skills to make themselves better–they want to make their images better, they want to better define their vision, and, alas, they try to make their websites better too.  In the midst of all the things out there to help you improve your photography, a very simple move you can make is to start participating in an online community that includes image critique forums.  Both Bret Edge and Justin Reznick have recently blogged on this topic, but I wanted to throw my $0.02 in, with a slightly different twist.

I began participating in photo critique forums over at Photo.net in 2005, not long after I started shooting.  At the time my images were pretty bad–by all measures, they simply weren’t that good.  While I did receive some constructive feedback, I mostly got images bashed by non-nature photographers.  They weren’t trying to be mean, but as I said, the images were pretty bad.  However, in 2006, I discovered Naturescapes.net and began participating in earnest.  My photographs, well, they still weren’t good, but I quickly became part of a community that helped me learn to improve not only my technique behind the camera, but also my post processing skills as well.

There are many important steps you can take to help improve your photography, and I believe that participating in a forum is one of them.  If you decide to participate, you SHOULD expect to put in just as much as you get out of it.  In other words, you need to participate, not just post a photo now and then, expecting everyone to fix your problems for you.  Also, you SHOULD feel free to ask questions.  In my personal experience, the forums I participate in are filled with people way more knowledgeable than I am, and I know I’ve looked like a doofus more than once with my questions.  While they may be snickering, people are always very nice in answering questions.  You also SHOULD have fun with it.  Although we are critiquing others’ photographs, forums are really a celebration of what we love doing: photography. Embrace that.

That said, if you decide to participate in a forum, you SHOULD NOT take it personally if someone says they don’t like one of your photos.  Ideally, that person would give you some reason as to why they don’t like it, but if they don’t it shouldn’t matter.  Photography–like any art form–is highly subjective, and if someone says s/he doesn’t like it, it shouldn’t stop you from liking your photo.  Beauty in photographs goes way beyond the surface, and viewers cannot always detect the special meaning behind a photograph. With that in mind, you SHOULD give critiques as you would want to receive them.  Not only will receiving critiques make you a better photographer, critiquing others’ photos will help that as well.  In that sense, participating in a forum will help crystallize your own photographic vision.  Finally, you SHOULD NOT be intimidated or threatened by other peoples’ outstanding images (yes, I know of people who feel very threatened…that for every good image someone else makes, they lose business….hogwash).  I feel honored to be able to share my work with these fantastic photographers; their work continues to inspire, motivate and humble me.  That’s the way it should be: photographers should encourage and inspire one another…not compete.

So what does the title of this post have to do with all this?  I write the above because I know what a valuable resource photography forums are, and I’ve just had (yet another) experience that proves it to me.  Last November, I made a quick run out to Joshua Tree National Park, with the intention of photographing Arch Rock.  That night, I took a star trail image, with the arch as the main subject, but I could never get it to work for me…something about the processing just looked “off”.  Last weekend, I saw a similar image of another arch, and thought, “Hey, I’ve got a shot very similar to that…maybe I can get it to work for me!”

When I got home, I pulled up the RAW file and processed it.  I wanted the arch to have a very warm feel, as I’d painted it with my headlamp, and I wanted it to stand out against the sky.  What I ended up with was a cool effect, but not what I remember seeing.  I posted it to Naturescapes.net and, while everyone agreed it looks cool, it just seemed a little too bizarre.

Arch Rock at night, Joshua Tree National Park, Californi

Attempt 1, Joshua Tree National Park, California, November 2009

Even with city lights nearby, I do not remember the sky looking that golden…er…pumpkin…that night.  While it occurred to me to use some layer masking, Alister Benn made some invaluable comments in guiding me on re-editing this image.  Alister is a master of night photography, and with his comments in hand, I re-edited the image, really making it pop.

Star trails over Arch Rock, Joshua Tree National Park, California

Star trails over Arch Rock, Joshua Tree National Park, California, November 2009

What I didn’t do is make a bombastic, unrealistic image from a RAW file.  I used valuable comments from a critique and discussion forum to process an image so that I had a realistic representation of the scene.  Many thanks to Alister, and to all my online friends for making for making this a great community of photographers!

Another silhouette from Joshua Tree National Park

Monday, November 23rd, 2009

As a follow-up to my last post on shooting silhouettes, I couldn’t help but share one more.  In the spirit of letting the subject speak for itself, I wonder what this subject is saying?

Self Portrait, Joshua Tree National Park, January 2009

Self Portrait, Joshua Tree National Park, January 2009

I think it has something to do with his desire to impersonate a large yucca.

Stark: photographing silhouettes

Friday, November 20th, 2009

Almost any photographer will tell you that they enjoy making images of pretty things.  Obviously “pretty” is subjective, but I’d lay the bet that most photographers wouldn’t argue with me.  Often times, I feel like I’m speaking for the subject by saying, “Hey, this place is really cool, look at it and admire it!”

Its natural for any artist to speak for their subject, and I really don’t believe there’s anything wrong with it.  But, sometimes, its nice to let the subject speak for itself.  This is why I like photographing silhouettes.

Joshua Tree Sunset, Joshua Tree National Park, California

Joshua Tree Sunset, Joshua Tree National Park, California

A silhouette–of a tree, mountain range, anything–stands before you, stark and naked, telling its own story.  Joshua trees (Yucca brevifolia) were given their name by Mormon pioneers crossing the Mojave Desert in the mid-19th century.  Their shape reminded the pioneers of a biblical story in with Joshua lifted his hands to the sky in prayer.  Looking at the above silhouettes of the joshua trees, you can almost see them raising their arms upward, paying their homage to the last vestige of the sun.

Twisted Dawn, Joshua Tree National Park, California

Twisted Dawn, Joshua Tree National Park, California

I’ll continue to speak for the land through my photography.  However, I think its instructive and important to find a way to let your subject speak for itself; sometimes its just screaming to be heard.  Finding your own powerful way of doing that will only help to make you a better photographer.

A quick visit to Joshua Tree National Park

Tuesday, November 17th, 2009

Last week’s Veteran’s Day holiday enabled me to sneak out to Joshua Tree National Park for the night.  In my ongoing series on Topophilia (there will be more posts on that in the near future), I have featured photographers who inspire me to think outside of the box.  In that spirit, I headed out for Joshua Tree, vowing to myself that I would making more images of the park’s namesake plants.  My goal instead was to visit a natural arch, called Arch Rock (and sometimes White Tank Arch), I had recently read about.  

Located on the Pinto Basin Road, the arch is a short hike from the White Tank campground, and I had the place to myself.  I’m still editing images, but here are two I made on my trip.

 

Arch Rock I, Joshua Tree National Park, November 2009

Arch Rock I, Joshua Tree National Park, November 2009

 

Arch Rock II, Joshua Tree National Park, November 2009

Arch Rock II, Joshua Tree National Park, November 2009

High Dynamic Range photography, part II: fixing the halo

Tuesday, August 4th, 2009

Yesterday, I outlined one of the biggest problems with HDR photography I’ve encountered since venturing down that road a couple of months ago: the dreaded halo.  The “fix” of getting around it is surprisingly simple, and I’ll walk you through it with an image I recently edited:

Sunrise, Joshua Tree National Park, California, January 2009

This is a 3-shot HDR that I processed just last week, after getting the courage to try HDR.  You might be asking why I’m not following through on the image I showed you yesterday.  Well, in the interest of full disclosure, I still haven’t processed it.  However, I will follow the same workflow on that image as for this one. 

I won’t post the source images, but I will post the tone mapped images.  For my workflow, I generally follow Royce Howland’s suggested settings  for both the DE and TC methods of tone mapping.  With that said, here is the image tone mapped using the DE algorithm:

jtree_DEtonemapped

There is some lens flare that I’ll later clone out, but do you see the halo around the joshua tree?  That light purple line all the way around the whole thing?  That’s what we want to get rid of.  Other than that, this image doesn’t look too bad; its lacking some midtone contrast, which is also characteristic of the DE tone mapping algorithm in Photomatix.

Now let’s look at the other tone mapped image, the one done using the TC algorithm:

jtree_TCtonemapped

What do you see?  First you see that its very contrasty–almost too contrasty–especially compared to the other tone mapped image.  However, what you don’t see is the halo!  The TC tone mapping algorithm does not give you a halo.  Good.  Now, we can open these two images in Photoshop and pick apart the best of both tone mapping methods.

I like to use the DE tone mapped image as my base image, and I copy and paste the TC image over the top of it.  The next step–the crux of this workflow–is to choose a blending mode for the TC layer that–at least mostly–eliminated the halo in the DC image.  I’ve had pretty good luck with Overlay, Color Burn, and Linear Burn, but probably the most success in Overlay.  Overlay multiplies the dark areas and screens the light areas, and logically would be good for eliminating the halo.  

Once you’ve settled upon a blending mode that looks more or less “natural”, you will need to adjust the opacity slider to make it look even better.  On this image, I settled for 35% opacity.  

I hate to be anticlimactic, but once you’re done blending these two layers, you’re pretty much done and can edit the image like normal.  There was a little halo still left at the top of the joshua tree, so I selected the inverse of the tree and just closed the sky to look less halo-ish.   In addition, I cloned out some lens flare, and applied noise reduction (I use Imagenomic’s Noiseware).  Other than sharpening and levels/curves I didn’t do much to it.  One thing I’ve found is that I don’t have to apply much saturation to HDR images–they look pretty good as is.

I hope that this has been helpful, and that you find it useful.  I’d love to hear feedback as you try this method with your own images!