[HDR-photo] HDRI Book and Jpeg brackets

[Bernhard Vogl]

Hello Sam, Perry,

Although the bounds are not always well defined, i prefer distinguishing between HDR (e.g. light probes) and MDR (e.g. basic bracketing) workflow. There are some essential differences - one of them is the amount of data captured for one panorama (HDR can easily be > 500MB for one panorama), another is the speed (if MDR brackets may be handleable by your in-camera buffer).
So your personal mileage may vary.

The point is, that a JPEG->HDR image will always contain more image information that one RAW image. Even when comparing the same number of images, the differences are less the more brackets you are shooting, as the generation process will only use the "middle" exposure range of your image - and retrieve the dark/bright areas (the ones prone to artifacts) from the previous/next source image in order.

Best regards
Bernhard

-------- Original-Nachricht --------
> Datum: Sat, 24 Nov 2007 14:12:41 -0500
> Von: "Perry Frantzman" <perycomo at gmail.com>
> An: "High Dynamic Range Photography" <hdr-photo at hdr-photography.com>
> Betreff: Re: [HDR-photo] HDRI Book and Jpeg brackets

> I too shoot Pano and HDR.
> I shoot in RAW
> Process in Photomatix than stitch in PTGui and than adjust the finished
> through Dynamic HDR and finish with LightZone.
> The Dynamic HDR does not handle ghosting as well as Photomatix but the
> processing through Dynamic HDR allows me more wow.
> I have been experimenting with shooting with RAW and than processing the 0
> EV through Dynamic HDR and than Lightzone.
> Be Well
> Perry
> PS.
> Just received the book from Amazon in the mail even though an email
> informed
> me that it would be due in December.
> 
> 
> On 11/24/07, Sam Kittner <sam at kittner.com> wrote:
> >
> > Firstly, I want to thank Christian Bloch for his outstanding and
> engaging
> > HDRI handbook.  It's a super resource. As someone who has been working
> on
> > hdr and panos for just about a year, the book confirmed many things I
> have
> > been
> > doing and opened doors of understanding to many things I haven't been
> sure
> > about.  I really appreciate the workflow examples by
> > Dieter Bethke and Uwe Steinmuller...as well as Bernhard Vogl's
> > contributions to the pano chapter.  Many thanks to them all.
> >
> >
> > One interesting item I found in the pano section was the hint to shoot
> the
> > bracketed images in jpeg format (yes, with all in-camera processing
> options
> > turned off).  I have been shooting raw format (nefs) since I began
> > shooting digital in 2001, primarily for the flexibility of the file
> > adjustment.
> > For my pano work I have shot raw...making no adjustment to the raw
> > files...then convert to tiffs (yes, storage space nightmare (I often
> shoot a
> > pano scene though dawn or dust and come away with hundreds of
> > exposures))...then work with the tiffs to get the hdr and tone-mapped
> tiffs
> > to stich.
> >
> >
> > But I can see the reasoning behind shooting the hdr intended images as
> > jpegs to save storage space and, as importantly in many situations with
> > movement issues, the faster write speed...therefore the ability to shoot
> the
> > pano faster...the jpegs then are used to create the hdr and resulting
> > tone-mapped tiffs for further image editing.
> >
> >
> > Does anyone see reasons not to shoot hdr intended images as jpegs?  I
> will
> > do some tests for myself, but wondering if there is any difference
> others
> > have found?
> >
> >
> > Many Thanks,
> > Sam
> >
> >
> >
> >  portfolio: <http://www.kittner.com>
> >
> > studio: 7056 Carroll Ave. #200
> >
> > Takoma Park, MD 20912
> >
> > p-301.270.8750
> >
> > cel-301.346.3534
> >
> >
> >
> >
> > _______________________________________________
> > HDR-photo mailing list
> > HDR-photo at hdr-photography.com
> > http://www.hdr-photography.com/mailman/listinfo/hdr-photo
> >
> >
> 
> 
> -- 
> Perry Frantzman