Showing posts with label digital photography. Show all posts
Showing posts with label digital photography. Show all posts

3D Printed Photograp via instructables


saturn side.jpg






The 3d printer in our office (an Objet Connex500) prints with a rigid, semitransparent white material that can be used to create these unique black and white photographic prints.  These prints may be indecipherable when viewed from the side, but when backlit with a diffuse light, they recreate images with surprisingly high precision and even add some subtle dimensionality and texture to the scene.


By varying the thickness of a region of this semitransparent print you can control the amount of light that is able to pass through, thereby controlling the brightness (thinner regions of material will appear brighter and thicker regions darker).  In this project, I've converted each individual greyscale pixel of an image to thickness, allowing me to precisely reproduce any greyscale image.  The photos I've printed include an adorable picture my mom took of our cat Teddy (fig 4), Saturn and its moon Titan taken by the Cassini space probe (fig 5 and 6), and a huge print (19x16") of Mt. Williamson by Ansel Adams (fig 1, 2, and 3).

Step 1: The Code

All of these 3D models were generated algorithmically from Processing using the ModelBuilder libraryby Marius Watz.  This library allows you to save 3D geometries in the STL file format, STL files that form a watertight mesh can be printed by a 3D printer.

To get started using this code yourself, download the latest version of the ModelBuilder library, unzip the file, and copy the folder into Processing's "libraries" folder.  If you have installed the predecessor to the ModelBuilder library (called the Unlekker library), you will need to delete it.  Once this is done restart Processing.


Copy the Processing sketch above and save it.  Processing will automatically put this file inside a folder of the same name.  Copy any greyscale images you want to convert into this folder.

To run the sketch, replace the part in quotes in following line:

String name = "YOUR_FILE_NAME.jpg";

with the name of your greyscale image. I believe .gif, .jpg, .tga, and .png files will all work fine, but I have only tested .jpg so far.  Run the sketch, after a minute or two Processing will tell you that it is writing an STL file and eventually it will tell you that it is finished.  The resulting file will be located in the sketch's folder named "NAME_OF_ORIGINAL_FILE.stl"

You can open the stl file with a variety of CAD software and stl viewers, I like MeshLab for simple viewing (it's free and open source).

By default my sketch will scale images to 8" wide, with a base thickness of 0.02" and feature thickness of up to 0.1", you can change these setting by adjusting the variable at the top of the sketch.


source via instructables.com

Canon EOS 60D DSLR - product reviews and prices - gallery

Canon has unveiled the EOS 60D mid-level DSLR, replacing the EOS 50D. However, following the launch of the EOS 7D, the 60D has been repositioned in the market, so isn’t a simple upgrade to its predecessor. Instead the 60D is a smaller camera featuring an articulated screen and plastic body shell and utilizing SD memory cards. It combines the 18MP CMOS sensor and 1040k dot 3.0″ LCD from the EOS 550D (Rebel T2i) with the AF system from the 50D. Meanwhile it gains the 7D’s HD movie capability. We’ve had a chance to use a pre-production 60D so have prepared a hands-on preview, including sample images and movies




High speed, high resolution
With an 18 Megapixel APS-C sensor, the EOS 60D offers high levels of detail and a magnification of 1.6x the focal length of the lens to capture poster-size images in a variety of aspect ratios*1. Canon’s powerful DIGIC 4 technology rapidly processes image information captured from the CMOS sensor’s four-channel output, providing outstanding colour reproduction, as well as high-speed shooting at 5.3fps in bursts of 58 full-resolution JPEGs.

A standard ISO range of 100-6400 is extendable to 12800, providing smooth images with minimal noise in low light conditions. A 9-point, all cross-type autofocus (AF) system also provides swift and accurate focusing, with an extra-sensitive centre point for lenses faster than f/2.8, allowing photographers to artistically employ a shallow depth of field during portraiture or for more atmospheric shooting.

The EOS 60D features Canon’s iFCL metering system, first introduced with the acclaimed EOS 7D, with a 63-zone Dual-Layer sensor. Information on subject location is gathered from the Auto Focus system, and is combined with colour and luminance readings for consistent accurate exposures whatever the situation. The Integrated Speedlite transmitter also provides in-camera control of multiple EX flash units for more creative lighting.

Shoot from all angles
A new 7.7cm (3.0”) Vari-angle wide LCD monitor features a 3:2 aspect ratio and a 1,040k dot resolution, providing added flexibility and allowing photographers to view their images in incredible detail. The Vari-angle wide LCD helps frame shots from difficult angles, and can be positioned with Live View enabled to achieve the desired composition if shooting isn’t possible using the viewfinder. The ability to capture wildlife portraits, overhead shots or ground-level photography is instantly enhanced, and the surface of the screen features an anti-reflective, water-repellent coating to protect the screen allows easy viewing in bright light and from a variety of angles.

Empowering creativity
A new Basic + function makes it easy for photographers to add their own creative touch to images without worrying about changing settings. Photographers can add ambiance to a scene by shooting according to lighting and scene type, with Portrait, Landscape, Close-Up, Sport, Night Snapshot or Creative AUTO modes all available. Different effects can be achieved by shooting with Basic + enhancements such as Daylight, Cloudy or Sunset or pre-set Picture Styles including Vivid, Soft, Warm or Monochrome.
Designed to provide power for those who wish to extend their creative vision, the EOS 60D features a host of new functions that help capture better images and in-camera effects to add an extra dimension. The powerful DIGIC 4 processor supports in-camera RAW image processing, allowing photographers to edit settings such as brightness, contrast, white balance or correct distortion or chromatic aberration. The edited image can then be resaved as a JPEG, ready to be printed or uploaded to a PC or the web.

For photographers who want to add post-production effects to their images without the need for expensive software, the EOS 60D also features a range of new creative filters that can be applied in-camera. Filters including Grainy B/W, Soft Focus, Toy Camera Effect and Miniature Effect provide images with a different feel, allowing photographers to create a themed collection – using Grainy B/W to give images a reportage style, for example – or easily smooth skin tone in portraits with Soft Focus.

EOS Movies: Full HD video with complete control
Offering photographers the freedom to go beyond stills, the EOS 60D captures 1920x1080p HD video with a variety of user-selectable frame rates, including 30, 25 and 24fps, as well as 720p video at 60 and 50fps. Movie Crop mode is also available, recording with the central 640×480 pixel area of the sensor to create an effective magnification of approximately seven times the focal length of the lens.

Full manual control in Movie mode allows photographers to employ their own exposure and focus settings and take advantage of the effects achieved from Canon’s wide range of EF lenses. An external stereo microphone terminal and the ability to adjust sound recording level ensures the audio track recorded matches the visual quality of the video, capturing broadcast-quality sound.

For those who want to share images with friends and family, an integrated HDMI port is compatible with Consumer Electronics Control (HDMI-CEC), allowing video and images to be viewed on any compatible HD-ready TV and controlled via the TV remote.

Designed for flexibility
The EOS 60D features a completely redesigned body, combining an ergonomically enhanced, curved shape with a new button layout to make it quick and comfortable for photographers to change settings. Frequently used camera controls are grouped together for easy access, while the Quick Control Dial, Multi-controller and SET button have all been merged into one Multi Control Dial, enabling photographers to operate menus and enter settings quickly using their thumb. The mode dial also features a lock button, preventing unintentional changes to settings mid-shoot.

A dedicated Quick Control access button allows photographers to instantly reach the most common shooting settings and playback controls. Customising the functions of a number of buttons is also possible, allowing photographers to tailor the camera to suit their individual needs. To help achieve landscapes with perfectly level horizons, a horizontal Electronic Level can be displayed in the viewfinder or in Live View to assist composition and remove any potential need for post-production correction.

The EOS 60D is one of the latest Canon models to support high-capacity SDXC memory cards, providing up to 2TB of available space, allowing photographers to keep shooting HD video and full resolution RAW and JPEG stills without changing cards. For better management of larger image libraries on the camera, EOS 60D photographers can add a rating of 1 to 5 to their favourite images, allowing them to be easily located and viewed on-screen. Once transferred from the camera to a PC, the tags can also be viewed using a number of image editing and management programs, including Canon’s DPP software.

Share the moment

For photographers who want to transfer content wirelessly, the EOS 60D includes Eye-Fi connected functions*2. The EOS 60D features a dedicated Eye-Fi section in the User Interface allowing WiFi functionality to be turned off when not required to save battery life
EOS 60D features at a glance:
18 MP APS-C CMOS sensor
Advanced creative features with Basic +
Vari-angle 7.7cm (3.0”) 3:2 ratio LCD
Full HD movies with manual control
DIGIC 4
ISO 100-6400, H:12800
5.3fps shooting for up to 58 JPEGs
9-point cross type AF System
iFCL metering with 63-zone Dual-layer Sensor
Integrated Speedlite transmitter
In-camera RAW processing

*1 1:1, 16:9, 4:3 in addition to the standard 3:2 dimension
*2 This product is not guaranteed to support Eye-Fi card functions (including wireless transfer). In case of an issue with an Eye-Fi card, please check with the card manufacturer. Also note that approval is required to use Eye-Fi cards in many countries or regions. Without approval, use of the card is not permitted. If it is unclear whether the card has been approved for use in the area, please check with the card manufacturer


Canon 7D’s APS-C sensor match the 5D Mark II’s full-frame sensor

 
One question I often get asked about digital SLRs is what’s the difference between a full-frame sensor (such as those in professional dSLRs like the Canon EOS 5D Mark II or Nikon D3S) and an APS-C-sized or “crop” sensor (such as those in most consumer-oriented dSLRs like the Canon EOS Rebel T2i or Nikon D3100, as well as higher-end cameras like the Canon 7D). And with semi-pro cameras like the 7D beginning to match or even better their big-sensored siblings specs- and feature-wise, it becomes an even more interesting question.



I recently came across the above video which helps provide one of the answers to just that question. Though “lens comparison test” is kind of a misnomer, this simple video (5Dmk2/7D lens comparison test from Mike Collins on Vimeo) offers a great visual illustration of how the difference in size between full-frame and APS-C sensors affects field of view (and focal length).

The video doesn’t actually compare lenses as the title implies; rather, it provides a good depiction of how the field of view differs between the two types of sensors when using the same lens. Using the same set of prime lenses (ranging from 20mm to 100mm) plus a Lensbaby Composer thrown in for fun, Collins shot test videos with a full-sensor Canon EOS 5D Mark II and a APS-C-sensor 7D set up on a tripod in the same spot.

As the video depicts clearly, the larger sensor provides a much wider field of view when using the same lens. So one benefit of the full-frame chip size is that you can have very wide angle lenses — thus, with a single lens (say, 28-105mm), you can get a good wide angle view as well as decent telephoto. But with an APS chip, the 28mm lens doesn’t produce a very wide-angle shot, though you do gain a lot on the telephoto end. (For a good, in-depth explanation, read Bob Atkin’s article on crop sensors and lenses.)

Of course the same number of pixels on a smaller size chip won’t give you the same image quality as a larger chip, because in order to cram more pixels onto a smaller sensor, you need to use smaller pixels, which will results in more noise and less dynamic range, and therefore poorer image quality.

So the short answer is that, all other factors being equal, a larger full-frame sensor will give you a wider field of view and better image quality than a smaller sensor.

For more information, check out:
BobAtkins.com: Crop Sensor (APS-C) Cameras and Lens Confusion
DPreview.com: Sensor Sizes

[Via Gizmodo]

GIMP Is One Agile Photo Tool


GIMP Is One Agile Photo Tool

GIMP Is One Agile Photo Tool
GIMP is one of the most able-bodied open source photo manipulation apps in the world, and its feature set rivals those of many proprietary -- and often downright expensive -- offerings. Its features will fix flaws in photos as well as enable the user to artistically manipulate images in a multitude of formats. However, most photo editors this advanced do require a bit of a learning curve, and GIMP is no exception.

This story was originally published on April 14, 2010, and is brought to you today as part of our Best of ECT News series.