Highlight Tone Priority Question mk3

I mostly shoot in sunny conditon's ( not that we get much in the UK )and most of my shots are Birds and Jets .
Often the bird will have a bit of white in it and the Jets will nearly always have Shinny part's.
For these subjects shot in the sun would it be best to put Highlight Tone Priority on ?
Rob.

I would say so, yes. For similar reasons I expect to use HTP when using my 40D at weddings.

I've been shooting with it on, birds, jets... It helps preserve the hightlights without underexposing the rest of the scene. Don't expect miracles, it only saves about one stop. Nothing is going to save sun light reflecting off white or silver.

I think it helped this shot. Sun was behind me to my left. Only blow-out is around the windshield.

IMAGE LINK: http://farm2.static.fl​ickr.com …23341225_98b128​cbe7_o.jpg

---Click for larger image---

This one couldn't be saved. Direct reflection from the sun. Though it probably helped.

IMAGE LINK: http://farm2.static.fl​ickr.com …24232266_9e3766​7ca8_o.jpg

GyRob wrote in post #3988781
I mostly shoot in sunny conditon's ( not that we get much in the UK )and most of my shots are Birds and Jets .
Often the bird will have a bit of white in it and the Jets will nearly always have Shinny part's.
For these subjects shot in the sun would it be best to put Highlight Tone Priority on ?
Rob.

If you are shooting in JPEG or using DPP to convert your raw to JPEG, then HTP will help with the white subjects, especially under bright sunlight. However, if you are shooting raw and converting using ACR or some other 3rd party converter that knows nothing about HTP, it really doesn't matter if you shoot at, say, ISO 200 with HTP on or ISO 100 with HTP off and underexpose by a stop. In either case, you'll need to readjust your exposure during raw conversion anyway.

Intresting PacAce
I mostly use cs3 for my Raw's so might as well stick at 100iso -i find the shadow highlight tool helpfull on some hot spots guess this works like HTP in some ways.
Rob.

PacAce wrote in post #3989439
If you are shooting in JPEG or using DPP to convert your raw to JPEG, then HTP will help with the white subjects, especially under bright sunlight. However, if you are shooting raw and converting using ACR or some other 3rd party converter that knows nothing about HTP, it really doesn't matter if you shoot at, say, ISO 200 with HTP on or ISO 100 with HTP off and underexpose by a stop. In either case, you'll need to readjust your exposure during raw conversion anyway.

Does the camera not take the photo at the settings related to setting the HTP, seems odd that the software changes it after you load it with DPP?

I not to sure if I am right, but using HTP and TV with ISO auto, may add a few stop variations on High lights, But someone else needs to confirm that.

Don't know about the mk3, but this is what Canon white paper says for the 40D, and I think it's the same principle in the mk3:
"Highlight Tone Priority seeks to improve highlight detail. The range is extended between 18% (“middle”) gray and the maximum highlight tone. This makes the gradation finer from the grays to the highlights and reduces blown highlights. The function limits the settable ISO speed range to 200-1600.*"

I believe that HTP is done in camera, not in the post-processing, but I could be wrong.

BogongBreeze wrote in post #4011148
Don't know about the mk3, but this is what Canon white paper says for the 40D, and I think it's the same principle in the mk3:
"Highlight Tone Priority seeks to improve highlight detail. The range is extended between 18% (“middle”) gray and the maximum highlight tone. This makes the gradation finer from the grays to the highlights and reduces blown highlights. The function limits the settable ISO speed range to 200-1600.*"

I believe that HTP is done in camera, not in the post-processing, but I could be wrong.

HTP is done in camera if you are shooting JPEG. It does nothing if you are shooting in RAW other than tag the appropriate metadata flag. That's the reason DPP can proces HTP images automatically whereas ACR and most other image processors can not. But that's not to say that you can't benefit from HTP if you use 3rd party raw converters. You can but you just have to adjust the image yourself.

PacAce wrote in post #4011179
HTP is done in camera if you are shooting JPEG. It does nothing if you are shooting in RAW other than tag the appropriate metadata flag. That's the reason DPP can proces HTP images automatically whereas ACR and most other image processors can not. But that's not to say that you can't benefit from HTP if you use 3rd party raw converters. You can but you just have to adjust the image yourself.

Oh, thanks for that info. Saves me bothering with it. Not sure why I thought it worked with raw files.

BogongBreeze wrote in post #4011203
Oh, thanks for that info. Saves me bothering with it. Not sure why I thought it worked with raw files.

Well, it works with raw files just like, say, AWB or any of the other WB settings "work" with raw files.

I got a bit curious and this link (among others) makes me think there may be a direct effect on raw files - but honestly, I'm no expert so I could be reading too much into this.

http://cpn.canon-europe.com …echnical/raw.do​#container

(especially page 3 of the link)

I'm wondering about this too.

I suspect that Leo is right, but something about the things I've read makes me wonder if HTP has a real "physical" (well, y'know...) impact on the exposure of the image.

I intend to test this, but I'm kinda short on time to do so at the moment.

I'm going out tomorrow morning and if I remember I'll take a few shots with and without - tho not sure how I'll test it yet. Rob Galbraith seems to think it makes a difference that cannot be duplicated in post-processing - about 1/3 of the way down this page (not a proper test as he took the shots a few seconds apart):
http://www.robgalbrait​h.com …_page.asp?cid=7​-8739-8970

PacAce wrote in post #3989439
If you are shooting in JPEG or using DPP to convert your raw to JPEG, then HTP will help with the white subjects, especially under bright sunlight. However, if you are shooting raw and converting using ACR or some other 3rd party converter that knows nothing about HTP, it really doesn't matter if you shoot at, say, ISO 200 with HTP on or ISO 100 with HTP off and underexpose by a stop. In either case, you'll need to readjust your exposure during raw conversion anyway.

PacAce can you please explain why, or where you have seen any info that makes you think this.

I checked 2 images taken in raw, and opened them in DPP and CS3, (ACR), one image with HTP on and one off in camera, and don't see anything that tells me anything different.
One thing for sure though, DPP reads and interrupts the raw data different from CS3, DPP seems to compress the range of the raw data in the histogram, from the shadow to the highlights, and it does it to the raw data from an image taken with and with out HTP, where as CS3 histogram seems to have a wider dynamic range, with HTP on and off, though with it on it seems to cap the highlights more.
Need other opinions on this, and I only checked a couple of images, I would be better off I think finding images where Highlights were more blown