Category Archives: Digital Photo Processing

Episode 9 – Processing Raw Files in Photoshop (ACR)

Show Notes:

In this weeks Photoshop Tutorial I show how to use Adobe Camera Raw (ACR) to process images. This is my own personal Camera Raw processing workflow. I will demystify the histogram, sliders, panels and other options in Adobe Camera Raw and introduce you to the techniques that let you intelligently adjust your images exposure. In this video I use a file that is about a stop and a half underexposed and show you not only how to correct this, but also how to fine tune the exposure, white balance and colour to produce a high quality final. I also show you how to use ACR for adjusting the Tone Curve, Noise Reduction, Sharpening and selective colour adjustment. All the techniques shown can also be applied in Lightroom 5 as the tools are the exact same.

Files Used:

Download the file I used in this tutorial here:

http://bit.ly/18yhOVO  – Camera Raw Sample File (18.9 Meg .DNG Adobe Digital Negative File)

Subscribe to my Channels:

Vimeo – https://vimeo.com/shawnkent

Youtube – http://www.youtube.com/user/ShawnKentPhotography

Podcast – http://itunes.apple.com/ca/podcast/shawnkent.net-photography/id687084409

Thanks for watching!

[Edit: My apologies to my Vimeo and Podcast audience. Some upload issues this week delayed release on these channels. Should be more consistent in the future.]

Episode 8 – Fix Photograph Highlights in Photoshop (Luminance Masks)

Show Notes:

In this weeks Photoshop video tutorial I provide a basic introduction to using a luminance mask to recover blown out highlights in an image. In the video I use a RAW file of a forest floor where the sky is overexposed and shining through the tree tops. Luminance masking is an interesting technique that allows you to selectively adjust the highlight tones (portions of the image that have a luminance of 50% or brighter). The reason that I use this technique for images that require highlight rescuing is that it produces better results than simply processing the image through Adobe Camera Raw and attempting to recover the highlights that way.

Files Used:

Download the file I used in this video to practice the technique here:

Luminance Masking Sample File (34 meg .CR2 Camera RAW File)

Further Reading:

If you enjoyed this tutorial and want to learn more I recommend these links:

http://goodlight.us/writing/luminositymasks/luminositymasks-1.html
http://www.cookseytalbottgallery.com/photo_blog_article.php?blRecordNumber=38

Subscribe to my Channels:

Vimeo – https://vimeo.com/shawnkent

Youtube – http://www.youtube.com/user/ShawnKentPhotography

Podcast – Coming Soon!

Thanks for watching!

Focus Stacking Tutorial for Photoshop CS5

Photoshop Focus Stacking Tutorial

This tutorial is available for download in PDF format with RAW sample images at the following location:

http://penzer.s3.amazonaws.com/PUBLIC/ShawnKent_Tutorials/ShawnKent-net_Focus_Stacking_Tutorial.zip

File Size: 216MB – File type: Zip Archive – Contains: PDF, Sample NEF files, Example PSD

This tutorial is also on youtube here:

http://www.youtube.com/watch?v=7Lvmd_IMExs

Introduction

One of the greatest challenges in macro photography is dealing with depth of field issues. In my line of work I often have to provide technical photographs of circuitry. I typically use a top of the line macro lens like the Nikon AF-S Micro-NIKKOR 105mm, for these photographs. Even though this lens produces amazing images, I am forever striking a balance between elaborate lighting setups and limited depth of field (DOF). Presuming I even produce enough light to shoot at the maximum DOF of f32 for this lens, I still find at these extreme close-ups depth of field can be an issue.

Thankfully post processing techniques provide us with a tool that makes all of this a bit easier. Focus stacking is not that different than HDR. In essence we are taking several images with one variable adjusted (in this case focus) to create one image. The result is an image that gives a resultant image with greater depth of field than the source image.

This technique can be used in all sorts of macro photography, from nature photographs to microscopy. Thankfully the technique is made painfully simple with modern imaging tools. There are a number of tools that can achieve these results (CombineZM, Helicon Focus, Magnification, etc.) however we are going to use Photoshop CS5 for this tutorial.
Continue reading »

Photographic RAW Files Explained

RAW Image Uncompressed

Figure 1 - RAW Image

A Disclaimer: The RAW file type is the digital photography world’s equivalent of a negative. But it is NOT a negative. The RAW file you capture has already undergone re-sampling, quantization, and a bunch of other things that would be too complex to go into here. The only true negative is the original RAW, the film negative. Even still film negatives contain vastly more information about a scene than a RAW file. However it is the closest you can get in a digital camera, and the reality is that the industry has “gone digital”. Film remains the vinyl record and RAW remains the CD. A JPEG on the other hand, is like a humble MP3.

So what is RAW?

To understand what a RAW file is you must first understand how a cameras sensor captures light. Essentially a camera sensor is an array of diodes each sensitive to light. Those sensors are called Silicon Photo Diodes, and exactly the same sort of thing you would find in light meters, motion detectors, etc. Essentially a Silicone Photo Diode is charged by the number of photons striking it. This charge is stored and then converted into voltage. This voltage is then amplified and converted by the ADC (Analog to Digital Converter) into a binary value. Continue reading »

Extended Definition Processing Tutorial for Photoshop CS5

Extended Definition Processing Tutorial Intro Image

Extended Definition Processing Tutorial Intro Image

This tutorial is available for download in PDF format with all raws and sample files here:

http://penzer.s3.amazonaws.com/PUBLIC/ShawnKent_Tutorials/ShawnKent.net -Extended Definition Processing.zip

File Size: 65.6MB – File Type:Zip Archive – Contains: PDF, Sample Raw Files, Example PSD

Introduction

THIS IS AN ADVANCED TUTORIAL,  KNOWLEDGE OF SMART OBJECTS AND RAW FILES IS ASSUMED.

Extended Definition Processing is a relatively new post processing technique created by Scott Kelby of Photoshopuser.com. The technique has a style similar to HDR with a hyper reality sense to it. This process accentuates reflective surfaces and makes an image pop without over saturating the colors. In this tutorial we will be working with a shot of a motorcycle. Continue reading »