FMS - The Fluorescent Mineral Society

flmixsw-enfused-2

Multiple exposures using the "enfuse" algorithm.

Date: 11/23/2008

Views: 661

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flmixsw-flash-only

White light view of the rather bland looking minerals.

Date: 12/09/2005

Views: 587

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flmixsw-summed

This is the result of merely summing each of the bracketed exposures. The contributions of the clipped overexposures effictively result in a response curve similar to applying a gamma function (but in linear sections). This works very nicely for luminance

Date: 11/23/2008

Views: 495

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flmixsw-chroma

Proper color information can only be gathered from the linearized HDR data. This is the resulting chroma, reapplied to a simple log-luminance rendition of the scene.

Date: 11/23/2008

Views: 541

0 votes

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flmixsw-linearized.exr

This is a linearized HDR (high dynamic range) image in OpenEXR format, ready for tone-mapping. It was generated from 15 bracketed exposures using my own low noise linearization algorithm. (Written in Java using the free ImageJ program.)

Date: 11/23/2008

Views: 540

1 vote

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flmixsw-linearized-clipped

This is the scene as it might be photographed using auto-exposure witha linear response curve, allowing some overexposure and clipping.

Date: 11/23/2008

Views: 558

0 votes

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flmixsw-linearized-unclipped

This rendition of the scene shows a simple linear response with no clipping. The colors are accurate, but the dynamic range is so great in the brightest parts of the image that everything else is too dim to see.

Date: 11/23/2008

Views: 464

0 votes

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IMG_1992

This is the shortest exposure in the bracketed source image series, right from the camera. There are no overexposed pixels here.

Date: 12/09/2005

Views: 648

0 votes

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IMG_1997

This is a source image from the middle of the bracket range. It might be typical if an auto-exposed photo of fluorescent minerals.

Date: 12/09/2005

Views: 481

0 votes

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IMG_2004

This is the longest exposure of the bracketed source images. It is long enough to capture the depest shadow detail with minimum noise. Noise limits the dynamic range of a single camera exposure, and the HDR method overcomes this with fewer exposures and b

Date: 12/09/2005

Views: 631

0 votes

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flmixsw-pmatix-noclip

This is the result of a typical HDR tone-mapping operation - this one from Photomatix. Some unnatural halos are evident in the thumbnail, but the end result shows good detail.

Date: 11/23/2008

Views: 437

0 votes

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flmixsw-setup

This shows the arrangement of camera, light source (80watt UVC transilluminator), and an aluminum reflector to balance the UV light.

Date: 12/09/2005

Views: 696

0 votes

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