Chortleberry
The joyous photo community
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
HDR Images | Forum |
|
Forums: Techniques: HDR Images
| Showing 1 - 5 of 5 posts. |
 munki boisPosted: 12th Apr 2008 Time: 12:28 PM |
I'm sure you've all seen loads of HDR stuff out there these days. I've had a go myself but can't seem to produce anything of any use. One thing I'm not clear on is the exposure settings. Everyone says that you need at least 5 differently exposed RAW files to process. Surely if you have a RAW files, the exposure settings are only implamneted when it's processed. If you get one RAW file and process it with 5 different exposure settings, surely that's the same? Anyone else had a go? |
|
mortcdz Posted: 12th Apr 2008 Time: 6:47 PM |
I'm just waiting for some decent weather to try this technique.
There are 2 approaches: First, the traditional style of bracketing a shot with 3 or more frames with different EV (e.g. -2,-1,0,+1,+2) to get a higher tonal dynamic range and then merging these shots in a software, Second, the easier one which is also helped by the advancements in the software processing technology and can even work on a single jpg file. Some famous software are: Photomatix Pro, Dynamic-Photo HDRi, etc. This isn't true HDR but an approximated approach. My cunning plan is to initially try to take 3 jpgs, with a range of white balance, then use the HDR function in Photoshop to merge them. One thing you do need is to have pictures with a sufficient range of highlights and shadows to ensure that the HDR effect is worth doing. So aim for sunrise or sunset for the best landscape colours. |
 WheelybirdPosted: 15th Apr 2008 Time: 10:44 AM |
HDR photos are a very clever idea, but I've not seen very many people produce results that I thought were worth the effort. However the successful images are quite spectacular.
I might give it a go myself now, but I don't seem to have much inspiration for photography these days. 
|
|
Tioadli Posted: 2nd May 2008 Time: 7:48 PM |
I've seen HDR images, but could someone put into words for me what they are exactly. I mean I know what they look like and could probably point to one if I saw one, I know the theory behind producing one, but if I had to define one I'm stuck. So, beginning with 'An HDR image is an image that...' could any wordsmiths like to enlighten me? |
|
Wheelybird Posted: 3rd May 2008 Time: 9:57 AM |
Well they're a photo that has a large range of light levels that still show detail.
So you'd have bright highlights and dark shadows in the same image, but there would still be detail in both of those; they wouldn't be areas of under or over-exposure. Digital camera sensors aren't as good as film in capturing a dynamic range, so usually to get a HDR photo digitally, you need to combine two or three different exposures of the exact same scene. You could either manually blend the exposures together with an image program, or there are algorithms which try their best to automate it. The automatic stuff tends to produce a bizarre, surreal effect. You don't need to do the clever digital manipulations to have a HDR image; film (especially black and white) already has quite a high dynamic range, and I think there are some expensive digital cameras (still and moving) which can natively produce HDR stuff. |
| Showing 1 - 5 of 5 posts. |
