Go Back   Steve's Digicams Forums > Digital Cameras (Point and Shoot) > Panasonic / Leica

Reply
 
Thread Tools Search this Thread
Old Mar 22, 2006, 7:50 AM   #1
Junior Member
 
samerlr's Avatar
 
Join Date: Jan 2005
Posts: 19
Default

Dear all,

I asked my friend who is now in china to buy for me the fz30 after maybe 1 year of investigations !! but the most that affect my decision was this forum and all the wonderful people in it

maybe this is the first time to submit on this forum however I am almost reading every article in it and i feel like u are my second family:-)

when I read the HDR article I was impressed .. and try to c how its good -waiting 4 my new pana- so I went to the following site http://glasslantern.com/RAWpository/index.htm

and download a canon eos rebel crw sample format and convert it to a tiff format so I can use it with the photmatix sw .. and try to generate a HDR image and that was the result .. I am impressed by this technique.

Before
[img]file:///H:/CRW_5045_resize.jpg[/img]



After

[img]file:///H:/CRW_5045.tif%20%20-%20Tone%20mapped_resize.jpg[/img]






Thank u all,

Samer.

samerlr is offline   Reply With Quote
Sponsored Links
Old Mar 22, 2006, 8:03 AM   #2
Senior Member
 
fmoore's Avatar
 
Join Date: Sep 2003
Posts: 2,116
Default

Samer - I'd like to see these images but they aren't showing up. To upload them from your computer you must go to the browse button under the reply message and select it from your hard drive Notice the max file size of 250kb. You can only post one image per reply. Put the Before imageina reply and then hit reply again and put theAfter there.
fmoore is offline   Reply With Quote
Old Mar 22, 2006, 8:12 AM   #3
Junior Member
 
samerlr's Avatar
 
Join Date: Jan 2005
Posts: 19
Default

Oh i am new to this thank u fmoor



before:


Attached Images
 
samerlr is offline   Reply With Quote
Old Mar 22, 2006, 8:13 AM   #4
Junior Member
 
samerlr's Avatar
 
Join Date: Jan 2005
Posts: 19
Default

After:


Attached Images
 
samerlr is offline   Reply With Quote
Old Mar 22, 2006, 10:16 AM   #5
Senior Member
 
fmoore's Avatar
 
Join Date: Sep 2003
Posts: 2,116
Default

Nice demo. Is this from 2 or 3 tiff files?
fmoore is offline   Reply With Quote
Old Mar 22, 2006, 12:06 PM   #6
Senior Member
 
treed's Avatar
 
Join Date: Feb 2006
Posts: 118
Default

Do you have to use tiff files when doing HDR or can you do RAW?
treed is offline   Reply With Quote
Old Mar 22, 2006, 3:13 PM   #7
Junior Member
 
samerlr's Avatar
 
Join Date: Jan 2005
Posts: 19
Default

Ok you have two or three options:

1-you can shoot the exposures with different shutter speed ex. 1/2 sec 1/40 and 1/350
and then use them to generate the HDR image

2-you can use auto exposure bracketing +-2 and use them to generate the HDR image

3-Finally you can use a RAW image -and that is the one I used here- the program will split the RAW image into 3 exposure and then generate the HDR from them and u must use the TIFF format.



Regards,

Samer
samerlr is offline   Reply With Quote
Old Mar 22, 2006, 3:22 PM   #8
Junior Member
 
samerlr's Avatar
 
Join Date: Jan 2005
Posts: 19
Default

Here is some information from www.hdrsoft.com site :

How do I shoot an HDR image?

Most digital cameras are only able to capture a limited

dynamic range (the exposure setting determines which

part of the total dynamic range will be captured). This is

why HDR images are commonly created from photos of

the same scene taken under different exposure levels.

Here some recommendations for taking the Low Dynamic

Range input images for the HDRI:

1. Mount your camera on a tripod

2. Set your camera in manual exposure mode. Select

an appropriate aperture for your scene (e.g. f/8 or

less if you need more depth of field) and the lowest

ISO setting.

3. Measure the light in the brightest part of your scene

(spot metering or in Av mode to point only the

highlights) and note the exposure time. Do the same

for the darkest shadows of your scene.

4. Determine the number and value of exposures

necessary. For this, take as a basis the exposure

time measured for the highlights. Multiply this

number by 4 to find the next exposure with a stop

spacing of 2 EV. Multiply by 4 successively for the

next exposures till you pass the exposure measured

for the shadows. (Note: For most scenes, 3-4

images should be sufficient to cover the dynamic

range).

5. You can make use of auto-exposure bracketing if

your camera supports it and if it allows a stop

spacing of 2. Otherwise, just vary the exposure

times manually.

Once your differently exposed images are taken, go to

"Generate HDR" on the HDRI menu of Photomatix, load

the images and click OK. This will create an HDR image

for your scene.

Photomatix lets you save the HDRI under 3 different

formats: Radiance RGBE (.hdr), OpenEXR (.exr) and

Floating Point TIFF. See Greg Ward's HDR Image

Encodings page for an excellent overview of HDR formats.







Can't I just create the exposures from one RAW

file?

Not really. Your RAW file contains data captured by the

sensors for only one exposure. The total dynamic range

you can reconstruct from one photo converted with

different exposure settings can never be more than the

dynamic range captured by your camera, and this is

rather limited (see above).

When you are using only one exposure to capture the

scene, your RAW file is already your HDR image.

Converting the RAW file to images with different

exposure levels is a bit like slicing the dynamic range of

the RAW into several parts. Combining back the parts

into an HDR image will at best re-produce the dynamic

range of the initial RAW file.


samerlr is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 8:54 AM.