Exposure control effecting Lumiance

Have others requested from Apple, that the Exposure slider effect lumiance only and not increase Saturation at the same time. Justs seems to me that exposure should be seperated from saturation especially since the Saturation slider is just below.
I find that there are at times some colorful objects in the scene that do not need any satuation but could benefit from the exposure being moved up. I know the work arounds.
Just thought Id ask to see if anyone else is bugged by this. Oh ACR 4.1 also does this so Apple is not alone. Just hoping that Apple will do it Right.
David

It's pretty much part of working in RGB.
Ian

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Photoshop's brightness and exposure controls?

Can anyone explain the difference(s) between Photoshop's brightness control and its exposure control?
Thanks,
Mark

Did it ever occur to you to consult the documentation, Mark. Say, the User Guide and/or the Help files?
Exposure command
Adjusts tonality by performing calculations in a linear color space. Exposure is primarily for use in HDR images. See Adjust Exposure for HDR image.
Adjust Exposure for HDR images
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The Exposure adjustment is designed for making tonal adjustments to HDR images, but it works with 8‑bit and 16‑bit images. Exposure works by performing calculations in a linear color space (gamma 1.0) rather than the current color space.
1. Do one of the following:
Click the Exposure icon or an Exposure preset in the Adjustments panel.
Choose Layer > New Adjustment Layer > Exposure.
Note: You can also choose Image > Adjustments > Exposure. But keep in mind that this method makes direct adjustments to the image layer and discards image information. Adjustment layers for 32-bit images are available in Photoshop Extended only.
2. In the Adjustments panel, set any of the following options:
Exposure
Adjusts the highlight end of the tonal scale with minimal effect in the extreme shadows.
Offset
Darkens the shadows and midtones with minimal effect on the highlights.
Gamma
Adjusts the image gamma, using a simple power function. Negative values are mirrored around zero (that is, they remain negative but still get adjusted as if they are positive).
The eyedroppers adjust the luminance values of images (unlike the Levels eyedroppers that affect all color channels).
The Set Black Point eyedropper sets the Offset, shifting the pixel you click to zero.
The Set White Point eyedropper sets the Exposure, shifting the point you click to white (1.0 for HDR images).
The Midtone eyedropper sets the Exposure, making the value you click middle gray.
=== === ===
Apply the Brightness/Contrast adjustment
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The Brightness/Contrast adjustment lets you make simple adjustments to the tonal range of an image. Moving the brightness slider to the right increases tonal values and expands image highlights, to the left decreases values and expands shadows. The contrast slider expands or shrinks the overall range of tonal values in the image.
In normal mode, Brightness/Contrast applies proportionate (nonlinear) adjustments to image layer, as with Levels and Curves adjustments. When Use Legacy is selected, Brightness/Contrast simply shifts all pixel values higher or lower when adjusting brightness. Since this can cause clipping or loss of image detail in highlight or shadow areas, using Brightness/Contrast in Legacy mode is not recommended for photographic images (but can be useful for editing masks or scientific imagery).
Note: Use Legacy is automatically selected when editing Brightness/Contrast adjustment layers created with previous versions of Photoshop.
1. Do one of the following:
Click the Brightness/Contrast icon in the Adjustments panel.
Choose Layer > New Adjustment Layer > Brightness/Contrast. Click OK in the New Layer dialog box.
Note: You can also choose Image > Adjustments > Brightness/Contrast. But keep in mind that this method makes direct adjustments to the image layer and discards image information.
2. In the Adjustments panel, drag the sliders to adjust the brightness and contrast.
Dragging to the left decreases the level, and dragging to the right increases it. The number at the right of each slider reflects the brightness or contrast value. Values can range from ‑150 to +150 for Brightness, ‑50 to +100 for Contrast.

Exposure control errors when recording videos with...

I noticed that when I record videos, the exposure sometimes is not adjusted properly. If lighting conditions change, exposure remains at the same level, and records became over or underexposed. This is especially noticeable outdoors.
I have a few minutes long sample recording where the recording starts normally, then as light conditions change, (I slowly move from a shady area to a lit area) exposure gradually degrades to a point where most of the recording "burns out" due to extreme overexposure ( about 80% of the picture is white).
What confuses me is when I tried to reproduce this problem (albeit it different lighting conditions), exposure control worked pretty good.
I wonder if these exposure problems are due to a bug, hardware problem or a device limitation.
Do you have any tips to get better recordings with the phone?
Nokia Lumia 520 3046.0000.1329.2001 RM-914
Nokia Asha 302 V15.09 22-05-13 RM-813

The phone runs the latest firmware (3.36) available currently. There are no image-related changes mentioned in the 3.36 changelog though.
Nokia Lumia 520 3046.0000.1329.2001 RM-914
Nokia Asha 302 V15.09 22-05-13 RM-813

Regional exposure control

Hi - I have several photos where, with Exposure at the default, the image is good except for
some way too bright highlights. If I reduce the Exposure control to the minimum, these highlights
are good, but of course the rest of the image is very dark. Using Highlights/Shadows/Recovery
does not give good results. Dodge doesn't work for this either.
Is there some way to use different Exposure settings in various parts of the image? I think
Brushes would do this, but there is no option to use Brushes for controls in the Exposure
brick. Any ideas?
-Wayne

Thanks for the reply William. Yes, one would expect that Dodge should do this
for me. These are images made in a church with clear glass French type windows.
At "normal" exposure, the crossbar window dividers completely disappear, as does
any detail around the window casing.
Reducing the Exposure control to a min. will give enough detail to make these
acceptable (tho not great). Using Dodge/Burn will not do as good a job. Neither
will Highlights or Recovery. They help a bit, but not as good as the Exposure
control. Doesn't make sense, does it. I haven't tried Curves, but it looks like you
can brush that, so I'll play with it.
-Wayne

Lightroom Exposure Control

Can I use LRs exposure control slider for the same function as it is used in my camera? I'd like to get additional shots but only have a -3, 0 and a +3 on the camera. I'm doing some photos in High Definition Imaging and want to increase the number if shots I put together with the HDL software...

There's a long story here, but the bottom line is -3 to +3 is plenty, and doing what you are proposing won't work nearly as well as doing it in-camera.

Next generation exposure control

In another thread I made a comment how the controls and interfaces on today's DSLRs are still firmly rooted in the analog age. On this occasion I wanted to start a discussion about how exposure controls should ideally work on a modern computerised DSLR.
Let's summarize the current state, we have P/Av/Tv/M to choose from, one or two wheels that control time or aperture depending on the mode we are in, then there's ISO which can be set manually by using the menu or extra buttons or, with restrictions, automatically, and exposure compensation, which also doesn't always work (e.g. doesn't affect auto ISO in M).
Obviously ISO, the third parameter besides time and aperture that controls the exposure, is still a second-rate citizen, otherwise we would have 8 insteaed of 4 major shooting modes, ISO auto/manual * time auto/manual * aperture auto/manual.
So how about three switches or buttons to toggle each individually from auto to manual?
Or how about three wheels, that each control one of these three parameters and toggle auto/manual with a click?
That way in full manual I have full control over all three; if all three are in manual, there's no exposure compensation; as soon as I switch one of the three to automatic, it becomes free to control exposure compensation!
And if two are in automatic and one in manual then one of the wheels whose parameter is on auto can be used for exposure compensation, and the other to control the bias of the automatic because in this scenario the automatic has two values under its control, so there are many combinations that are valid, and I'd like to tell the automatic whether to prefer large apertures or higher ISOs, for example.

RichLavigne wrote:
well thought out
Thanks. Just noticed that I forgot to include freely configurable limits for all the parameters that are chosen automatically, preferably focal-length and IS dependent...

Exposure control vs. Brightness control

Could someone explain the difference between the exposure control (slider) and the brightness control. They both seem to move the histogram in similar manners.
And if there is a difference should one always correct for WB first, then exposure, then brightness?
Or Exposure first then WB?
Thanks!

Exposure adjusts the full tonal range while the brightness control adjusts the mid tones without clipping the highlights and shadows.
It is good practice to get the exposure/brightness correct before making color corrections including wb.

Camera needs exposure controls - badly

I've scanned this forum and haven't seen any messages that are wondering where the iPhones exposure controls are.
As we all know, the iPhone does a great job of taking images when there is plenty of light on the subject. But if you shoot an environment with a contrasting backlight, the foreground subject is simply a silhouette.
It would be a very simple matter to increase exposure time to better illuminate foreground subjects in these sorts of scenarios. Yes, it MAY require the user to hold the phone extra steady while the shot is taken (or, if the sensor has ISO type controls, it could simply bump up the ISO which would increase noise in the shot but it would be sharp).
Apple - please give us a few manual override presets we can activate with a single touch when needed, or better still an exposure slider. It would increase the usefulness of the camera.
thanks!
(and yes, I am sending this to feedback, I am just curious how others feel about this)

Interesting replies. Not what I expected, but thanks just the same. To address some of the replies, in no particular order:
- the purpose of the iPhone is to eliminate duplicity of gadgets. I just want the camera in the iPhone to work a wee bit better than it does now.
- the sensor inside the iPhone is capable of taking better pictures under something less than ideal conditions. If a simple exposure slider would fix this, I fail to see how this would be 'stupid'.
- I don't expect 'award winning' images from an iPhone. I would like to be able to see a persons face if taking the image where the light isn't concentrated on the subject. All of the dirt cheap and most basic point and shoot cameras do this. Its just software to control the sensors sensitivity.
- I'm a professional photographer, I have plenty of cameras. The iPhone could never be a substitute for any of them. But I do know the camera can do a better job, with a simple software tweak. Thats all I am asking for.
- I'm aware that this is a user to user forum, and I've already mentioned sending this to feedback. I said this in my initial post. But its clear that I'm in the minority on the desire for the camera to improve with a simple software update. No biggie.

How does referencing a property of top-level control effect a sub-VI's timing?

I've got a Graphic User Interface (GUI) with some buttons and text controls. First I bundle the references to these controls into a cluster and send it to a utility sub-VI where the cluster is saved in a switch register (the process called functional global). Then I have a 10 Hz loop in the GUI VI to monitor the controls locally. In a separate loop, I start a sub-VI that eventually leads to the utility sub-VI with the control references. When I use these references with the "Property | Value" it seems to effect the timing of the sub-VI.
Currently I'm running the entire application using LabVIEW's default priority and execution system. It appears that when the sub-VI encounters the Property Node reference to an external control, the sub-VI loses its place at the head of the CPU queue, thus allowing other VI's to process.
I'm considering assigning the utility sub-VI a higher priority and/or execution system but I'm not sure of the ramifications. I've read Application Note 114, "Using LabVIEW to Create Multithreaded VIs for Maximum Performance and Reliability", but it's dated July 2000 and does not seem to cover Property Nodes.
Is there a connection between using Property Nodes for external controls and system timing or is my testing flawed?

Property nodes and the VIs which use them all are forced to run in the User Interface execution system. This is what causes the change in your VI timing.
To change the value of an indicator without "moving" the subVI to the UI execution system, try passing the data to the GUI VI by means of a queue. This should allow updates without waiting for the subVI to finish and without causing the slowdown. The Enqueue qnd Dequeue functiosn are quite fast so the added ovehead should have minimal effect on your timing.
Lynn

How Do You Control Effects?

Hi,
Just a quick question. I want to control my delay on a lead vocal track, basically riding the level of delay up and down depending on what section of song I am at. What is the best way to do this? Can I draw the effect level somewhere like you can with volume or is there a way to "print" the effect onto a track where you could control it with the fader?
thank you, J

Hi,
Just a quick question. I want to control my delay on
a lead vocal track, basically riding the level of
delay up and down depending on what section of song I
am at. What is the best way to do this? Can I draw
the effect level somewhere like you can with volume
or is there a way to "print" the effect onto a track
where you could control it with the fader?
thank you, J
Yes, with track-based automation, you can just draw the intensity in, which sounds like what you are looking for...
On the "view" menu, choose to view the track automation for your vocal track. If the delay effect is already on that track, click the track's dropdown menu, choose the delay plugin, and then choose the aspect you want to automate - probably "mix."
A line appears across the track, and you can create points on the line by clicking it. You can move these points up and down, and if you hold your click on a segment of a line between two points, you can move that segment vertically or horizontally.
Hope this helps!
15" Powerbook 1.33 GHz Mac OS X (10.3.9) Running Logic 7.1, Alesis Photon X25 Midi Controller/Audio Interface
15" Powerbook 1.33 GHz Mac OS X (10.3.9) Running Logic 7.1, Alesis Photon X25 Midi Controller/Audio Interface

Novation SL Remote. Can it control effects plug-ins?

Hi I have the Novation Remote SL. It automaps to instrument plugins but does nothing when i open an effects plug in. Does anyone know if its possible to automap to an effects plug-in? Thanks

I distinctly remember an advertisement blurb quoting that automap works with logic instruments. I took this as meaning it didn't work for effects. Call me cynical!
Also, as the control number for each effect parameter also depends on the slot the effect is in, you have a continually changing set of control numbers for each effect, depending on which slot it's in - so probably no way for Automap.

Hot key assignment for exposure control

Hi
I'm running 100s - 1000's of sequentially exposed images in LR and as a finishing step I'm ajusting exposure (+/_ 1/3 step) to various images in the quick develop module. Can I assign hot keys to these controls? Do they aready exist?
Thanks!

I can't find standard key shortcuts that work in Quick Develop. But if you go into Develop and click on the word "Exposure" in the Basic panel, you can then use the + and - keys to adjust Exposure in small increments, and shift/+ and shift/- to use larger increments, then use the right arrow key to move to the next image - so the Exposure slider retains the keyboard focus. The . (dot) and , (comma) keys step this keyboard focus up and down through the various sliders.
Or, if you specifically want to use Quick Develop for its relative adjustment behaviour (for example, across several images highlighted) you might check out something like this:
http://photographers-toolbox.com/products/keyboardtamer.php
or there's one called RPG Keys with the option of a separate keypad or similar (though I don't know whether either meets your specific requirement)
or more radically, this:
https://sites.google.com/site/dorfl68/

Exposure Control setting for HDR

I know RAW can contain multiple exposures within the format, but when taking RAW images, when shooting for HDR what should the exposure range be set to 3 photos or 5 photos and;
-0.5 to + 0.5 EV ?
- 1EV to +1 EV ?
-2 EV to +2 EV ?

Depends also if you are using the new Adobe Camera RAW or the new Lightroom (6) or CC2015.
The newest software has some fantastic new ways of combining for HDR. With the new ACR and Lightroom, I have found that 2 to 4 images depending on the dynamic range of the scene, will work well. I have gotten fantastic results with 2 images in the new software, compared to doing the same HDR in the older versions of Photoshop. Just make sure that YOU expose for the highlights in one image and then for the shadows in the other. If you are letting your camera do the AEB, auto exposure bracketing, then try 2 stops. However if you see your three images either too dark or too light (highlights blown in both or shadows dark in both, then try adjusting the settings. Hope that makes sense

Exposure control in Vision Builder AI

Hello,
is there any way of adjusting the exposure time and/or gain of a NI17xx camera programmatically ??

Hi Borst
Yes, you can set the value in vision builder. check the links for help http://zone.ni.com/devzone/cda/epd/p/id/6319 and http://digital.ni.com/public.nsf/allkb/2B9B31A6E53A8D2586257673006482B5
Sasi.
Certified LabVIEW Associate Developer
If you can DREAM it, You can DO it - Walt Disney

Controlling effects in Captivate 7

I want to have an effect that scales a background picture for the length of the slide. Although I have set the effect duration on the timeline to be the length of the slide - it does it's scaling in the first couple of seconds. I basically want to have a background image scaling very slowly, so it gives the impression of movement. (Need to output HTML5 if this makes any difference, but also doesn't work as SWF (although it work in the effects live preview.)
Any help would be appreciated.

Hello and welcome,
Could you switch to Effects workspace, and post a screenshot of both the Timeline and Effects panel?
Lilybiri

Exposure control effecting Lumiance

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