Archive for the ‘Photoshop’ Category

Photoshop, Filters, Speed

Wednesday, July 18th, 2007
Paris in the Spring

A lot of the images that I work on in Photoshop are big. Really big. And no, I’m not digitally manipulating pictures of Paris Hilton, though that is an interesting thought. I can see her sporting a stylish goatee and mustache. Now when I say big, I generally am addressing pictures whose smallest dimension is larger than 3000 pixels.

As it happens I frequently want to experiment with the Photshop filter set to see what impact different filters have on the image. It is especially interesting to see the results of combined filter effects. The problem is that even with a fast PC with loads of memory, Photoshop will take some time to process the complete image and I am just to impatient to wait.

My solution is as follows. First, I identify a section of my original image which is not only representative of the entire image but includes part of the image area for which I am most interested in seeing the filter’s effects. I try to keep the dimensions of this area to that of my screen at 100% resolution - so we’re talking approximately 1400 by 1000 pixels. Using the Rectangular Marquee tool, I then select that area of my image and Ctrl-C to copy it. Then Ctrl-N to open the new document dialog. Just click the OK button and then Ctrl-V to paste the selection into the new document. For the pictures that I work with, on average this new document represents about a 90 percent or more reduction in the number of pixels Photoshop has to work with.

I am now free to speedily experiment with different filters and different combinations of filters. Once I’ve figured out what I want to do, I then go back to the source image and apply the desired filter effects.

So next time you have a really big image and want to test out some filter effects, consider working with a only a portion of your image.

Ad Astra, Jim

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Photoshop for Web Site Design

Monday, July 16th, 2007
Chicago Society for Space Studies web siteChicago Society for Space Studies web site.

Saturday I completed a total redesign of the Chicago Society for Space Studies web site - which in part explains why I haven’t been posting new entries here lately. And since I was in the process of doing the redesign, I took the opportunity to also write an article outlining the process. That article - A Web Site Redesign - appears on my Astrodigital web site.

The redesign I performed would not have been possible without the use of 2D graphics software. Of course my software of choice is Adobe Photoshop. While I have used Photoshop before to create buttons, logos, banner images, and web page elements, I had never used it to create a total graphic page design. That design, shown above, was actually quite easy to create.

For the banner image, I felt that a night view of the Chicago skyline would be most appropriate since it combines the elements of Chicago and space via the presence of the night sky. The Chicago skyline is a composite of two photographs taken at night from the site of Chicago’s Adler Planetarium. To capture the two images, I set my camera up on one of my tripod’s and shot in manual mode, which allowed me to control ISO, speed, and aperture. I also created a new version of the CSSS logo that fit in better with the banner image color wise.

The most time consuming part of the design process was not the actual creation of the design, but rather coming up with the mental image of the type of design I wanted to create. I was guided in this process by looking through free web site template sites. There is more on that in the A Web Site Redesign article.

Realization of the site graphic/design was accomplished by creating a multi-layered Photoshop document. I started by creating a solid background, the color for which I was sure to note as I would use this color to define the web page’s background color in the CSS (Cascading Style Sheet) file. This was layer one. On layer two I made a rectangular selection of an area of the same size as the page area, feathered the selection, and filled it with a dark gray: this would serve as the shadow area around the page content area. Back to the rectangular marquee, on layer three I selected a rectangle and filled it with white: this would serve as the content area background. On layer four I added the Chicago skyline image. I placed the CSSS logo on layer five. By putting the logo on its own layer, I was free to experiment with positioning the logo and while keeping my options open for any future changes. Next up the layer ladder, on layer six I created a rectangular selection and filled it with gray: this would be the area used to hold the horizontal navigation bar. Layer seven was used to create the frame that serves as the page border. The frame around the page was made by simply creating a rectangular selection, feathering the selection, converting the selection to a border selection, and then stroking the path. I then used a layer style to give the border a 3D effect.

It was all pretty simple actually. The final step was to switch to ImageReady and slice up the image into the appropriate components. It was then necessary to create the CSS that would reassemble the individual graphic components while allowing for content control within each of those individual areas.

Once I had my CSS and XHTML template created, it was just a matter of replacing the old page layout code with the new code. Not mentally challenging but tedious. The worst part of the whole process was validating all the HTML associated with the content as I had decided to change from coding using an HTML doctype to an XHTML doctype.

If you want to take a closer look at the design, and learn a little bit about space in the process, I encourage you to visit the Chicago Society for Space Studies web site.

Ad Astra, Jim

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Mars Reconnaissance Orbiter Data Released

Monday, June 25th, 2007
Mars Reconnaissance Orbiter Image of Polar Layers
Mars Reconnaissance Orbiter Image of Polar Layers

At long last instrument data files from the Mars Reconnaissance Orbiter have been added to the NASA PDS Imaging Node web site. Present is data from the High Resolution Imaging Science Experiment (HiRISE), Context Camera (CTX), and Mars Color Imager (MARCI). While the Context Camera has returned some great imagery, it is entirely overshadowed by the pictures captured by the High Resolution Imaging Science Experiment. Most impressive was a HiRISE image that showed not only the Mars Exploration Rover Opportunity but the shadow from the PanCam mast. This picture can be seen on the Victoria Crater at Meridiani Planum TRA_000873_1780 page.

For those not familiar with the NASA PDS Imaging Node, this is the place to go to obtain the raw data files for various instruments from a variety of NASA planetary missions. Quoting from the news release about the addition of MRO data, “a PDS data node is designed to provide access to a particular data set during an active mission, when the data are of greatest interest” The Data Holdings Catalog page provides a full index to the data resources available. Note that as of this writing, the Mars Reconnaissance Orbiter data has not been added to the list. However, you can bypass the PDS home page and go directly to the Mars Reconnaissance Orbiter Online Data Volumes.

The image used to illustrate this entry (see above) is a 100 percent resolution subsection of a Context Camera image. To process the image I used Adobe Photoshop. I began by doing a dual High Pass Filter effect to sharpen the image. I then colorized the image using both a color layer and a Hue Saturation Adjustment layer, applying the two in tandem. The final step was to add a Curves Adjustment layer to increase contrast in the picture.

Some Useful Mar Reconnaissance Orbiter Links

Ad Astra, Jim

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A Review of Serif PanoramaPlus 1

Wednesday, May 23rd, 2007
Before and After Using Serif PanoramaPlus
Which Flag Do You Prefer? Before and After Using Serif PanoramaPlus 1

I was in a local bookstore last week going through the magazine section and pulled the current issue of the astronomy magazine BBC Sky at Night. I’m in the habit of going through all the astronomy magazines in search of interesting articles. Unfortunately for Sky at Night I’ve never came across an article in their magazine that would make it worth its price. Looking at the May 2007 issue, it wasn’t what was inside the magazine that grabbed my interest but what was on the CD that comes with the magazine.

The CD has a full version of Serif’s PanoramaPlus, version 1. This program automates the creation of panoramic images given a list of individual source images. Previously I had created my panoramas by using Adobe Photoshop’s Transform Tool and layer masks. Needless to say the Transform Tool is definitely suboptimal - especially when it comes to altering the geometry of the individual images. While I wasn’t thrilled that as a part of the software activation process I had to call the UK offices of Sky at Night, I figured that would be cheaper than going out and buying the software. What bugged me about this is that for all other magazines containing CDs with full versions of software being offered, I’ve never had to make a phone call to activate the product: either it was ready to go or all I had to do was point my browser at the specified web page to complete the registration.

Fortunately the software did have a one time use without registering so that I could fire it up and test it out. I fed the program a total of 11 images from an Apollo 16 EVA to merge. Their combined file size was 8.5 megabytes. PanoramaPlus quickly stitched them together and as far as I could tell from the software’s preview window, had done a good job of it.

The final step was to export the newly created panorama. Therein lies the source of my disappointment. The only export format available was to save as a jpeg. Not only that but there was no option to specify image quality and no documentation identifying what compression setting the software was using. The other shock was the size of my new panorama - just 3000 pixels wide. PanoramaPlus had taken 11 separate images with a combined width of 25,740 pixels and combined file size of 8.57 megabytes and created a panorama just 3000 pixels wide with a file size of 880K.

As a before and after comparison I took the American flag from the panorama and enlarged it to match the flag in one of the source images. The comparison of the two flags is shown at the top of this article. Note that the image shown is a scaled down version of the full size comparison. On the left is the original source flag image and on the right is the flag image from the PanoramaPlus panorama, upsized to match the size of the original flag. The qualitative difference is obvious.

Going to the Serif web site, I see that they are now on version 3 of the software so it is probably no longer the same product. Bottom line: if you’re thinking of buying the May 2007 issue of Sky at Night because of the PanoramaPlus version 1 software, don’t - big mistake. And the special upgrade offer they are running in the magazine: if you’re in the U.S. and paying in U.S. dollars, the standard price for the software is cheaper than the Sky at Night special “discount.”
Ad Astra, Jim

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Photoshop NSS Banner Let’s Build a Future Together

Friday, May 11th, 2007
NSS Banner Let's Build a Future Together
Photoshop National Space Society Banner Let’s Build a Future Together by Jim Plaxco

Last night I submitted an entry to the NSS (National Space Society) Banner Design Contest. What made my submission unusual is that I am one of the judges for the contest. This left my fellow judges wondering what my intentions were - was I dropping out as a judge to become a contestant? Did I want a crack at the $500.00 cash prize? Not at all I explained. The night before (Wednesday) I had gone to the NSS Banner Design Gallery to look over the submissions that I would be voting on. Unfortunately I didn’t see any that I really liked. Most were far too science fictiony for my tastes given that these designs are to be used to produce a banner promoting the NSS and its chapters. I expressed my negative feelings to my fellow judges in an e-mail. After sending that e-mail, I thought “why just criticize - what can I come up with?” I figured that I would see what I could do so later that night I set out to create my own banner design. It is that design which is the illustration for this post. You can see a larger version on my submission page.

In creating this banner, there were five basic elements to consider:

  • the background image
  • the NSS logo
  • the NSS name
  • an appropriate slogan
  • creating a composition from these individual elements

For a background, I decided to go with a lunar landscape that featured an Apollo LEM (Lunar Excursion Module). To achieve this, I composited together a series of Apollo 16 70mm Hasselblad images. These became a single layer in my Photoshop document. I located a separate image of the Earth, also from the Apollo 16 mission, taken en route to the Moon. I brought this into Photoshop as another layer. To this I added a Hue/Saturation adjustment layer as a clipping mask and slightly increased both the saturation and lightness of the Earth.

I now had to come up with a slogan. A page full of scribbled ideas later, I decided to go with “Let’s Build a Future Together.”

Lastly, with the Moon, the Earth, my slogan, the NSS logo, and the NSS name all on separate Photoshop layers, I began to work with both the placement and the sizing of the individual elements. At this point the only element that remained static was the lunar background. I eventually arrived at a composition that I was happy with and called it a night.

Yesterday after work I used the automated design submission form to enter my design in the contest. Why not give it a try yourself. You can find all the details about the contest at the National Space Society Banner Design Contest web page.

Ad Astra, Jim

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Desert Reality?

Tuesday, May 1st, 2007
Desert Reality Inspired Bird House
Desert Reality Inspired Bird House

Looking through my April issue of Rangefinder magazine I came across an interesting profile of photographer Ed Freeman. Titled Desert Reality, the article focuses on the composite images Freeman created and then used for his book Desert Reality. While the photographs appear totally realistic, they are fakes. For Freeman, Adobe Photoshop is as important as his camera because his “photographs” are actually very well done creative composites. The theme is that of unusual or dilapidated buildings, isolated, and placed into a California desert setting. Freeman photographs a building, removes it from its original setting, and then composites it with a desert landscape and an appropriate sky.

One fascinating aspect pointed out in the article is that the background mountain range in all but one image in the book actually came from the same source photograph. Freeman used various Photoshop techniques to alter the appearance of the mountains for each of the images in which it was used.

If you visit the book’s web site, www.desertrealty.org, there is a gallery displaying some of the images from the book. There is also a before and after feature whereby for two of the images from the book you can see the original photograph of the building and then the building as composited into the desert landscape. You may also want to visit Ed Freeman’s web site.

As I was writing this entry, it occurred to me that I would need an appropriate illustration. I went to Imageafter.com to grab a couple stock photos. One of the first pictures I found was of a bird house - that would be my structure. Next was to find an appropriate background. Seeing an image of a stately lawn, I knew that I had my picture. It was a simple task to use Photoshop’s Lasso Tool to isolate the bird house from its background and drag it in as a new layer on the lawn photo. Positioning the bird house slightly back from the central gravel path seemed natural. I then used a combination of the clone stamp and eraser tools and layer masks to blend the base of the house with the gravel path. The final step was to create a shadow layer for the bird house so that its lighting would match the shadows being cast by the trees to the left. One thing I thought of doing but didn’t was to enlarge the bird hole and add a sign “Beware of Bird.”

Just one more example of how Photoshop can be the digital photographer’s best friend.

Ad Astra, Jim

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The Me Sphere

Thursday, April 26th, 2007
The Me Sphere Created with Photoshop and Mojoworld
The Me Sphere Rendered Using Pandromeda Mojoworld

Last time I wrote about my first submission to The Sphere Project at CGSphere.com. My submission was titled Puzzle Sphere. I have since yanked that submission and replaced it with a new one more to my liking.

Titled The Me Sphere, this new submission uses as the sphere’s material a portrait of myself processed using Adobe Photoshop, a transparency map created in Photoshop, and finally rendered using Pandromeda’s Mojoworld.

The two most interesting aspects of this project were creating the texture and working with the scene lighting. For the texture I took a photograph of myself that I had handy on my hard drive and began to experiment using Photoshop. I went through several iterations to achieve the affect I desired. Next was working with the lighting in Mojoworld. In my original Puzzle Sphere submission, I used the Mojoworld Sun as the lighting source. For this submission I substituted a special effects light with a gel applied to get the multicolored lighting.

I must confess that I find The Me Sphere much more appealing than the Puzzle Sphere - I hope you do to. So go check out The Me Sphere - before I pull it and replace it with something else.

Ad Astra, Jim

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Swirly Planetary Rings and Photoshop

Thursday, April 5th, 2007
Planet Rings but no Planet

This is not a tutorial. It is a Not Tutorial. Confused? Hopefully it will all be clear by the time I’m done. More than once I have come across tutorials on how to use Photoshop to create planetary rings. In fact since this is totally Photoshop specific, it will serve as the inaugural posting to a new topic section devoted to Photoshop. While I have mentioned Adobe Photoshop in several previous postings, I have never gone into sufficient detail to warrant creating a Photoshop category - until now.

Back to planetary rings and Photoshop: there is a widely prescribed method for creating rings which I call the swirly clouds method because it relies on Photoshop’s Twirl Tool. Let me give you a quick run through of how these tutorials proceed. We’re not going to worry about the planet. Our focus is on the ring system and how it gets created.

Photoshop Planet Rings Tutorial

  1. Start up Photoshop.
  2. Create a 1000 by 1000 pixel document.
  3. Fill the background layer with black.
  4. Create a new layer named Rings.
  5. Make the Rings layer the active layer.
  6. Filter -> Render -> Clouds
  7. Filter -> Distort -> Twirl using an angle of 999°. Repeat two more times.
  8. Activate the Elliptical Marquee Tool
  9. Position your cursor at the center of the document and click-Alt-Shift to create a centered perfectly circular selection. Drag to the desired inner boundary for your rings, release, and press the Delete key to remove the inner swirly area.
  10. Position your cursor at the center of the document and click-Alt-Shift to create a centered perfectly circular selection. Drag to the desired outer boundary for your rings, release, press Shift-Ctrl-I to invert the selection, and press the Delete key to remove the outer swirly area.
  11. Ctrl-T to activate the Transform tool. Flatten and tilt to create the perspective you want for your planet’s rings.

And that’s all there is to it. Note that following step 10 you could have added noise, color, whatever. Not bad for five minutes work.
But there is a problem, especially if you want your rings to be big. Take a close look at the rings that you have just created and at the rings in the picture below.

Planet Rings Errors

The red dots mark points where the rings appear out of nothing and disappear into nothing. These points are a direct result of using Photoshop’s Twirl Tool to create a circular material. Granted they are not very noticeable but they are noticeable and not at all realistic. Real rings just don’t work like that. While there may not be a quicker way to create rings for your planets, there are better ways.

My advice is if you are serious about your planet’s rings and your rings are going to be large and you come across a Photoshop tutorial that expounds the basic twirly ring methodology: ignore it. Having said that, I will point out that the rings used to illustrate this “not” tutorial were made using the swirly rings method.

Note: It has come to my attention that Internet Explorer is unable to display the numbers for the ordered list used to identify the individual steps in the tutorial. Obviously IE is developmentally challenged. Firefox has no difficulty displaying the numbers

Ad Astra, Jim

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