Understanding the Differences Between 'Fake HDR' and Real Bracketed Exposure HDR

Photographers often seek to create images that capture a broader range of light and detail than what the human eye can perceive. HDR (High Dynamic Range) photography is a technique that allows for this, but it's not always clear whether the HDR image has been created using genuine bracketed exposure or through some form of 'fake HDR' processing. In this article, we’ll explore the differences between these two methods.

What is HDR Photography?

High Dynamic Range (HDR) photography aims to reproduce a broader range of luminosity than what is directly possible in the camera and without the need for certain imaging artifacts or human perception limitations. HDR is achieved by taking several shots of the same subject at different exposure levels and then merging them into a single image that digitally maintains the detail from all exposures. This technique is particularly useful in scenes where the contrast between shadows and highlights is extensive, such as backlit landscapes, night scenes, or high-contrast indoor environments.

Real Bracketed Exposure HDR

One of the most common and reliable methods to produce HDR images is bracketed exposure. This technique involves taking multiple photographs of the same scene at different exposure settings. Typically, a photographer will take three or more photos: one underexposed, one overexposed, and one at the correct exposure. These images are then combined using software to create an HDR image that showcases details from all three images in a harmonious way.

Step-by-Step Guide to Bracketed Exposure HDR

Choose a camera that supports multiple exposure modes or has an intervalometer for precise timing. Most modern DSLRs and mirrorless cameras have this capability.

Set up your camera on a tripod or stabilizer to minimize camera shake.

Take the first shot with the correct exposure settings (EXIF information should match, meaning the same aperture, ISO, and shutter speed).

Adjust the exposure by manually or automatically setting the exposure to underexpose and overexpose the same scene. These additional shots should be taken in intervals of -2 to 2 stops to cover the dynamic range of the scene.

Export the images to a post-processing software such as Adobe Photoshop or Lightroom. Here, use the HDR feature to merge the images.

Adjust the tone mapping to balance the details and create the desired effect.

This method is called 'real' because it relies on the actual differences in captured light and requires no post-processing beyond merging and possibly a bit of editing. Real HDR images have a more realistic and natural appearance, capturing the true essence of the scene.

Fake HDR

While bracketed exposure is a legitimate and effective technique for HDR photography, some individuals may resort to 'fake HDR', a term used for the process of boosting the dynamic range in already captured images without taking multiple exposures. This technique can range from applying filters and enhancing details in a single exposure to using advanced software with sophisticated algorithms to mimic the look of an HDR image. Although the term 'fake HDR' might seem pejorative, it can indeed be a useful tool when shooting in difficult lighting conditions.

Differences and Advantages

The main differences between real HDR (bracketed exposure) and fake HDR lie in the authenticity of the image as well as in the processing steps required. Real HDR photos are constructed from multiple original images and maintain the integrity of the original light sources. Fake HDR, on the other hand, distorts the original image data to create an appearance of deeper dynamic range.

Authenticity: Real HDR images accurately represent the light and shadow conditions of the scene, while fake HDR can sometimes lead to unrealistic or over-processed results.

Processing Time: Real HDR requires more time to capture multiple exposures and process them. Fake HDR can be done much more quickly, as it relies on existing image data.

File Size: Real HDR images often have a higher file size due to the merge process, while fake HDR may result in smaller file sizes.

Stereotypic vs Realistic Look: Real HDR maintains a more lifelike and natural appearance, whereas fake HDR can sometimes create a cartoonish or unrealistic aesthetic.

Choosing Between the Two Methods

Choosing whether to use real or fake HDR depends on the specific needs of the project. For professional and high-end work, real HDR is often preferred for its authenticity and ability to capture the true essence of the scene. However, for simpler projects or when expedience is a priority, fake HDR can be a pragmatic choice, especially when dealing with tricky lighting scenarios where capturing bracketed exposures might not be feasible.

Conclusion

HDR photography is a powerful tool for enhancing the visual quality and impact of photographs, but it's crucial to understand the difference between real and fake HDR. Real HDR, achieved through bracketed exposure, offers a more authentic and detailed representation of light and shadow. Fake HDR can be a quick and effective solution for certain scenarios, but it may not always yield the best results, particularly for professional or artistic purposes. Whether you choose to use real or fake HDR, always strive for a balance between technical skill and artistic vision to create truly impactful images.

References

For more detailed information and sources on HDR photography, consider the following:

Understanding HDR Photography by Photography Life

Real vs Fake HDR: What You Need to Know by PhotoSrk

The Art of HDR Photography by Scott Kelby