Tag: image processing

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Beyond the Shutter: Redefining Photography with Lytro Desktop 4

This tutorial introduces the Virtual Camera features within Lytro Desktop 4, demonstrating how “living pictures” go beyond static images by capturing the entire light field. The video explores how photographers can manipulate optical properties after the shot is taken—actions that were traditionally impossible with standard digital cameras.

Introducing the Virtual Camera
(Source: Lytro, Adam Gould, March 13, 2018, Original URL, Archived URL)

Video Summary

TimeframeDescription
00:00 – 00:05Introduction and objectives of the video.
00:06 – 00:25Interactive approach to change optical attributes (focus and perspective shift).
00:26 – 00:41Previewing all-in-focus versions of pictures.
00:42 – 01:54New optical adjustments in Lytro Desktop 4, specifically aperture control.
01:55 – 02:37Focal plane tilt and rotation adjustments.

Detailed Breakdown

  • Interactive Controls (00:00 – 00:25): The speaker demonstrates how users can interact with their pictures by clicking to change the focus point and clicking/dragging to see a perspective shift.
  • Aperture Adjustment (00:26 – 01:54): The video highlights the revolutionary ability to change the aperture in post-capture. It explains that Lytro cameras capture 3D data at a wide aperture (f/2) but store data equivalent to a much narrower aperture (around f/16), allowing for a range of focus adjustments.
  • Focal Plane Tilt (01:55 – 02:37): This feature allows users to adjust the tilt and rotation of the focal plane, simulating the effect of a tilt-shift lens. The video shows how to use the “Virtual Camera” group in the sidebar to modify these settings.

Key Takeaways:

  • Post-Capture Control: Users can interactively change the focus point and shift the perspective of an image simply by clicking and dragging.
  • Virtual Aperture: The software allows you to adjust the aperture from f/2.0 to f/16. This enables you to transition from a shallow depth-of-field with creamy “bokeh” to an all-in-focus shot where every detail is sharp.
  • Focal Plane Tilt: The Virtual Camera simulates tilt-shift lens effects, allowing you to tilt or rotate the plane of focus. This can be used to keep multiple subjects at different distances in focus simultaneously or to create creative, miniaturized aesthetics.
  • The “Living Picture” Concept: By capturing 3D data rather than a 2D plane, Lytro allows for a cinematic level of creative freedom during the editing process.

Explore more videos in this series:

  1. Introducing the Virtual Camera
  2. Adjusting Living Pictures
  3. Animating Living Pictures
  4. Exporting Living Pictures
  5. Introducing Focus Spread
  6. Present Your Living Picture
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Exporting XRaw Files from Lytro Desktop 5

Understanding XRaw Lfr Files

XRaw Lfr (*.lfx) files are the native format of Lytro® Light Field Pictures (LFP). These files contain the complete depth and color information captured by a Lytro camera plus calibration data.  This file type allows for advanced post-processing and creative manipulations.

Prerequisite

Download and install Lytro Desktop 5. You can download it from https://www.realistec.com/lytro-desktop-5-the-ultimate-toolkit-for-interactive-photography.

Steps to Export XRaw Lfr Files

1. Open: Launch the Lytro Desktop 5 software on your computer.

2. Import Your Image: Navigate to “File” in the main menu, and click on the “Import…” option.

Choose “Selected Files” from the Import dropdown menu and select the Lytro picture (*.lfp,*.lfr,*.lfx) you want to export by clicking on the “Browse…” button. The file path to that Lytro picture will appear in the Location text field. Next, check “Process immediately after import” under Options and click on the “Import” button.

3. Access Export Options: Click on the picture within the Lytro Library preview window to select it. An orange border will appear around the image. Then click on “File” in the main menu. From the dropdown menu, select the “Export…” option.

4. Select Export Format: In the export dialog, make sure the Save As selection is set to “XRaw Lfr (*.lfx)”. This will ensure the image is exported in its original light field format with the camera calibration data.

5. Choose Destination: Click the “Browse” button to select the desired location on your computer where you want to save the exported XRaw Lfr file, and click the “OK” button.

6. Initiate Export: Once you’ve configured your settings, click the “Export” button to start the process. The software will save the XRaw Lfr file to the specified location.

By following these steps, you can successfully export your Lytro images as XRaw Lfr files, preserving their unique light field properties for your Spatial Prints order.

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Extracting Depth Maps from Your Samsung Galaxy Photos

If you have a Samsung Galaxy phone that takes Dual Capture photos while in Portrait mode like the Samsung S10+ then you might have run into some trouble trying to extract the embedded depth map from the photo. Many online tools designed to extract depth maps fail to recognize the hidden depth metadata of these images because they were originally developed for the Google Camera app called Lens Blur. This leads them to incorrectly assume the photos are flat. The screenshot below shows an example where no depth data was found using a popular app.

While web-based image editors are also convenient, they may not always recognize depth maps as a separate layer, let alone provide the ability to view it. The screenshot below shows that same Portrait-mode image file where no depth data was found.

Using ExifTool (Version 12.30 or newer) to Extract Depth Maps

Don’t worry, there’s a solution! You can use the free software called ExifTool to extract the depth map yourself. ExifTool, a versatile command-line tool, is ideal for extracting and manipulating metadata from various image file formats.  An update to ExifTool was released in August 2021 to decode DepthMapTiff from JPEG images of more Samsung models.

Comparison of observable Portrait-Mode image with Color Point effect applied and extracted Depth Map TIFF image

Here’s a basic guide to get you started:

1. Download ExifTool: You can download it for free from https://exiftool.org/.

2. Install ExifTool: Follow the installation instructions for your operating system.

3. Open a command prompt or terminal: The exact steps may vary depending on your operating system.  To open the Command Prompt (CMD) in Windows, you can use the keyboard shortcut “Windows key + R” to open the Run dialog box, then type “cmd” and click OK.

4. Navigate to your directory: Use the  cd  command to change to the directory containing your photo.  In the following example, the file path “C:\Users\Realistec\Pictures” refers to a directory (or folder) on a Windows computer. Here’s a breakdown of its components:

  • C: This is the drive letter of the primary hard drive on the computer.
  • Users: This is a folder that typically contains subfolders for individual user accounts on the computer.
  • Realistec: This is the name of a specific user account on the computer.
  • Pictures: This is a subfolder within the user’s account that is typically used to store images and photos.

Therefore, the full path “C:\Users\Realistec\Pictures” points to the “Pictures” folder within the “Realistec” user account on the primary hard drive (C drive) of the computer.

Example: cd C:\Users\Realistec\Pictures

5. Run ExifTool: Start by using the following command to generate an output (*.txt) file with detailed metadata information:

 exiftool -a -u -g1 -w txt myphoto.jpg 

  • Remember to replace “exiftool” with the entire file path to your installation.
  • Also, remember to replace myphoto.jpg with the actual filename of your photo.
  • The text file will be saved as myphoto.txt 

Example: C:\Users\Realistec\Desktop\exiftool-12.97_64\exiftool -a -u -g1 -w txt 20240901_113727.jpg

6. Open the newly created sidecar text file: This file provides important metadata, including Image Size, Megapixels, and Depth Map details.

7. Check for the ‘Depth Map Tiff’ Metadata Tag: If the file contains this specific metatag, as shown below, proceed to the next step.

8. Extract the Depth Map: Use the following command to extract the depth map image, which is identified by the ‘-DepthMapTiff’ Composite Tag:

exiftool -b -DepthMapTiff myphoto.jpg > myphoto_depth.jpg

  • Again, remember to replace “exiftool” with the entire file path to your installation, and replace “myphoto.jpg” with the actual filename.
  • Add “depth” to the second filename. 
  • The hidden depth map image will be extracted and saved as myphoto_depth.jpg

Example: C:\Users\Realistec\Desktop\exiftool-12.97_64\exiftool -b -DepthMapTiff 20240901_113727.jpg > 20240901_113727_depth.jpg

9. Extract the Embedded Image: Copy the last command by pressing the up arrow key. Then, replace “-DepthMapTiff” with “-EmbeddedImage” by pressing the left arrow key and backspace to delete. You will also need to replace “_right” with “_image” to create a new file.  The command will look like this:

exiftool -b -EmbeddedImage myphoto.jpg > myphoto_image.jpg

Example: C:\Users\Realistec\Desktop\exiftool-12.97_64\exiftool -b -EmbeddedImage 20240901_113727.jpg > 20240901_113727_image.jpg

That’s it! If done correctly, you should have the original photo, a depth map, an unfiltered image, and a metadata text file.

Now that you have your depth map, you can use it for a variety of applications, from creating depth-of-field effects to generating creative assets like perspective-shifted animated GIFs and videos.

Perspective-shifted animated MP4 video example