Tuesday, April 26, 2011
Friday, April 22, 2011
The Power of Words
"The difference between the right word and the almost right word is the difference between lightning and the lightning bug."
--Mark Twain
--Mark Twain
Saturday, April 16, 2011
Tuesday, April 5, 2011
The Rule of Thirds and the Golden Ratio in Web Design and Photography
http://www.arsgrafik.com/rule-thirds-golden-ratio-web-design-photography/
เรื่องเก่าเอาเก็บไว้เล่าใหม่ค่ะ ^^ You can see how the rule of thirds influences web design even in basic blog layouts. When we designed our blog, we created a two-column theme to maintain order and minimize distractions away from the actual content. A two-column theme also allows for larger image sizes, and this site is (obviously) going to be graphically-focused so we need all the space we can get! In terms of the rule of thirds, you can see that our sidebar column takes up around a third of the page layout.
"We all know how important it is to create stellar image composition. But you don’t have to have an “artist’s eye” in order to wow your viewers—just follow these timeless techniques to ensure that your designs are spot-on every time.
The rule of thirds is commonly used in composition today, but the concept has dated back some 2,400 years to ancient Greece with the mathematical discovery of the golden ratio. Without getting into the nitty gritty of the equation, it shows that asymmetry and a 1:3 proportion are aesthetically (and scientifically) pleasing.
Nature abounds with the golden ratio, as you can see from the nautilus image above. My sketch on top of it further demonstrates the ratio. First, you see the outer rectangle with a geometric arc that intersects at pivotal points to create a spiral. Looking closer, you’ll notice that the outer rectangle is cut in two, giving us a square and another rectangle. The ratio repeats itself again and again in each rectangle, leading eventually to a “sweet spot,” where the rectangles grow smaller and become more concentrated.
There are a total of four sweet spots in the golden rectangle, depending on how you first begin constructing it—think about where that spot would be located if you were to flip this image horizontally and vertically.
It’s a good idea to keep these sweet spots in mind when framing and editing images. I’ve posted some of my own images below to show how the rectangle can be applied to photographs to make for some easy editing.
Notice how your eye goes directly to the boat in the sunset.
The rule of thirds and the golden ratio are important philosophies to remember when framing images, but don’t let them override your own creative spirit. There will always be exceptions to the rule, but as I learned long ago, you have to learn the rules before you can break them."
Hyperfocal Distance
http://www.dofmaster.com/hyperfocal.html
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"The concept of hyperfocal distance is easy to understand: focus a lens at the hyperfocal distance and everything in the photograph from some near distance to infinity will be sharp. Landscape photographs are often taken with the lens focused at the hyperfocal distance; near and distant objects are sharp in the photos.
Application of the concept leads to many questions: Which lenses are best for using hyperfocal distance focusing? What is the hyperfocal distance for a lens? How do I focus at the hyperfocal distance? Do I have to focus exactly at the hyperfocal distance? In this article we'll look at the basics of using hyperfocal distance to maximize depth of field in a photograph... Read more
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Where to focus (Hyper Focal Distance)
เรื่องการหาจุดโฟกัสในการถ่ายภาพแบบแลนด์สเคปนี้มีปัญหามานานและยังมีบ้างต่อไป แต่น้อยลง (ขอบคุณคุณJoe Panch ที่เคยแนะนำเรื่องนี้ไว้) หาที่เขียนดีๆ ให้เข้าใจได้ง่ายมานานเพิ่งเจอค่ะ เลยเอามาแปะเผื่อมีคนมีปัญหาเดียวกันจะสนใจ
by Jeff Revell, Canon 50D, From Snapshots to Great Shots, Peachpit Press, 2009, pp-182-183
"Large landscape scenes are great fun to photograph, but they can present a problem: where exactly do you focus when you want everything to be sharp? Since our goal is to create a great landscape photo, we will need to concentrate on how to best create and image that is tack sharp, with a depth of field that renders great focus throughout the scene.
I have already stressed the importance of good tripod when shooting landscapes. The tripod lets you concentrate on the aperture portion of the exposure without worrying how long your shutter will be open. This is because the tripod provides the stability to handle any shutter speed you might need when shooting at small apertures. I find that for most of my landscape work I set my camera to Aperture Priority mode and the ISO to 100 (for a clean, noise-free image).
However, shooting with the smallest aperture on your lens doesn't necessarily mean that you will get the proper sharpness throughout your image. The real key is knowing where in the scene to focus our lens to maximize the depth of field for our chosen aperture. To do this, you must utilize something called the "hyper focal distance" of your lens.
Hyper focal distance, also referred to as HFD, is the point of focus that will give you the greatest acceptable sharpness from a point near your camera all the way out to infinity. If you combine good HFD practice in combination with a small aperture, you will get images that are sharp to infinity.
There are a couple of ways to do this, and the one that is probably the easiest, as you might guess, is the one that is most widely used by working pros. When you have your shot all set up and composed, focus on an object that is about one-third of the distance into your frame. It is usually pretty close to the proper distance and will render favorable results. When you have the focus set, use your Depth of Field preview button to check the sharpness of all the objects in your scene. The button is located just under the lens release button and is activated once you have depressed the the shutter button partway."
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เอาข้อมูลที่อ่านมา กับที่มีคนเอามาฝากมาแปะรวมกันตรงนี้ค่ะ (ขอบคุณNapnik สำหรับข้อมูลเพิ่มเติมค่ะ)
From the link above: HFD from dofmaster.com
"The concept of hyperfocal distance is easy to understand: focus a lens at the hyperfocal distance and everything in the photograph from some near distance to infinity will be sharp. Landscape photographs are often taken with the lens focused at the hyperfocal distance; near and distant objects are sharp in the photos.
Application of the concept leads to many questions: Which lenses are best for using hyperfocal distance focusing? What is the hyperfocal distance for a lens? How do I focus at the hyperfocal distance? Do I have to focus exactly at the hyperfocal distance? In this article we'll look at the basics of using hyperfocal distance to maximize depth of field in a photograph... Read more
Where to focus (Hyper Focal Distance)
เรื่องการหาจุดโฟกัสในการถ่ายภาพแบบแลนด์สเคปนี้มีปัญหามานานและยังมีบ้างต่อไป แต่น้อยลง (ขอบคุณคุณJoe Panch ที่เคยแนะนำเรื่องนี้ไว้) หาที่เขียนดีๆ ให้เข้าใจได้ง่ายมานานเพิ่งเจอค่ะ เลยเอามาแปะเผื่อมีคนมีปัญหาเดียวกันจะสนใจ
by Jeff Revell, Canon 50D, From Snapshots to Great Shots, Peachpit Press, 2009, pp-182-183
"Large landscape scenes are great fun to photograph, but they can present a problem: where exactly do you focus when you want everything to be sharp? Since our goal is to create a great landscape photo, we will need to concentrate on how to best create and image that is tack sharp, with a depth of field that renders great focus throughout the scene.
I have already stressed the importance of good tripod when shooting landscapes. The tripod lets you concentrate on the aperture portion of the exposure without worrying how long your shutter will be open. This is because the tripod provides the stability to handle any shutter speed you might need when shooting at small apertures. I find that for most of my landscape work I set my camera to Aperture Priority mode and the ISO to 100 (for a clean, noise-free image).
However, shooting with the smallest aperture on your lens doesn't necessarily mean that you will get the proper sharpness throughout your image. The real key is knowing where in the scene to focus our lens to maximize the depth of field for our chosen aperture. To do this, you must utilize something called the "hyper focal distance" of your lens.
Hyper focal distance, also referred to as HFD, is the point of focus that will give you the greatest acceptable sharpness from a point near your camera all the way out to infinity. If you combine good HFD practice in combination with a small aperture, you will get images that are sharp to infinity.
There are a couple of ways to do this, and the one that is probably the easiest, as you might guess, is the one that is most widely used by working pros. When you have your shot all set up and composed, focus on an object that is about one-third of the distance into your frame. It is usually pretty close to the proper distance and will render favorable results. When you have the focus set, use your Depth of Field preview button to check the sharpness of all the objects in your scene. The button is located just under the lens release button and is activated once you have depressed the the shutter button partway."
อันนี้เป็นลิงก์สำหรับคนชอบคำนวณ
* :: Focus Pocus :: Depth of Field Calculators for Photographers
อันนี้ลิงก์ต้นกระทู้จาก pantip.com ค่ะ แต่บางทีคลิ้กแล้วหาหน้าไม่เจอจากทางนี้ แปะไว้ก่อน เผื่อกลับมาแล้วเข้าได้
http://topicstock.pantip.com/camera/topicstock/O3001253/O3001253.html
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