Two newbie questions - Colors and ETTR - General Discussion and Assistance - CHDK Forum
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Two newbie questions - Colors and ETTR

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Offline pauledney

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Two newbie questions - Colors and ETTR
« on: 03 / August / 2015, 09:44:24 »
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Greetings from a CHDK newbie! I discovered and installed CHDK 1.3 on an ELPH310HS and have to say that after having playing around for a few days with some of the features, I am still picking my jaw off the floor. I am using firmware 1.00B, determined by dragging a picture onto Acid.

I have two questions that I haven't figured out (and haven't found an answer to in the forums):

1. When I show the R G B histogram (either "always" or "shoot"), they show up as grey—unlike the pictures int he manual. In fact, most of my interface colors are mostly tones of grey or orange.

I have tried to adjust it in OSD Layout (the histograms were clipped, too) and reset the CHDK colors, but neither worked. I did notice, however, that colors are also wrong in the CHDK Color Test. The battery, USB, and file icons do show up in the right colors if I display them.


2. I saw a few mentions of ETTR in very old posts, but don't see that function anywhere on the camera or in the user scripts. Does it go under a different name? Right now, I display the histograms and adjust with the quick EV option, which does work quite well for me.


Aside from the minor color issue, this is amazing work! I'm just kicking myself for not finding out sooner :(

Cheers,


Paul
 
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Offline reyalp

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Re: Two newbie questions - Colors and ETTR
« Reply #1 on: 04 / August / 2015, 16:58:47 »
Quote from: pauledney on 03 / August / 2015, 09:44:24
1. When I show the R G B histogram (either "always" or "shoot"), they show up as grey—unlike the pictures int he manual. In fact, most of my interface colors are mostly tones of grey or orange.
It looks like the bitmap palette (UI colors) were never really set up on this port.

If you can provide screenshots of the CHDK palette display (color settings->draw palette) in both playback and record mode, we may be able to improve this.

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2. I saw a few mentions of ETTR in very old posts, but don't see that function anywhere on the camera or in the user scripts. Does it go under a different name? Right now, I display the histograms and adjust with the quick EV option, which does work quite well for me.
There is no ETTR function in CHDK at the moment.
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Offline pauledney

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Re: Two newbie questions - Colors and ETTR
« Reply #2 on: 17 / August / 2015, 11:11:45 »
Sorry for the delay. Was out for a while. PTP didn't let me grab pictures with the lens out, so I hope these phone shots will do. I have 4 pictures: one with the lens closed and 3 with the lens open and different color backgrounds to show transparency.

Thanks for the help! Let me know if you need anything else.

--P.
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Offline pauledney

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Re: Two newbie questions - Colors and ETTR
« Reply #3 on: 17 / August / 2015, 11:13:19 »
Part 2 on other backgrounds to illustrate transparency, per my previous post.
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Offline reyalp

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Re: Two newbie questions - Colors and ETTR
« Reply #4 on: 17 / August / 2015, 16:00:50 »
Quote from: pauledney on 17 / August / 2015, 11:11:45
Sorry for the delay. Was out for a while. PTP didn't let me grab pictures with the lens out
Out of curiosity, what prevents you from doing this with PTP?
edit: This should be possible, so may indicate another bug.

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, so I hope these phone shots will do.
Yes, that's fine. It may take me (or another developer) a while to get to doing anything about it.
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Offline pauledney

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Re: Two newbie questions - Colors and ETTR
« Reply #5 on: 17 / August / 2015, 19:06:40 »
Here are the issues I had that made me believe PTP wasn't a faithful representation of the display on the camera. I have also attached two screenshots made with PTP:

  • Starting up in play mode, the image on the camera doesn't look like the one in PTP (scrambled sunset, image not filling the full display in PTP — even when selecting the various scaling options in the Live tab. The original image has a tree on the right (the dark fuzz), and each repeating 1/3 of the image is actually the right 2/3 of the original image;
  • The OSD menus on the camera look different in both scale and color than on the PTP display;
  • I cannot switch to Rec mode/lens out on the camera to get a "live" view in PTP; for one, connecting the USB cable seems to disable any ability to extend the lens. If I remove the USB cable, then extend the lens, then the camera returns to Display/Playback as soon as I insert the cable.

I also noted that inserting the USB cable prevents me from moving back and forth between images in playback mode. I have to remove the cable, press <- or -> to go the the previous/next image, then reinsert the cable.

Now, all that being said, you're talking to someone who tried to connect to PTP for 20 minutes before realizing that he had the "USB Remote" option selected! Stupid in hindsight, but a stark reminder that I'm still discovering CHDK.

On an unrelated note, I got my first raw/DNG pictures into Lightroom and the increase in sharpness was nothing short of stunning compared to the factory-issue Jpeg. Well done.

--P.
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Offline reyalp

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Re: Two newbie questions - Colors and ETTR
« Reply #6 on: 17 / August / 2015, 22:20:22 »
Quote from: pauledney on 17 / August / 2015, 19:06:40
1. Starting up in play mode, the image on the camera doesn't look like the one in PTP (scrambled sunset, image not filling the full display in PTP — even when selecting the various scaling options in the Live tab. The original image has a tree on the right (the dark fuzz), and each repeating 1/3 of the image is actually the right 2/3 of the original image;
2. The OSD menus on the camera look different in both scale and color than on the PTP display;
OK, these look like bugs in the port.
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cannot switch to Rec mode/lens out on the camera to get a "live" view in PTP; for one, connecting the USB cable seems to disable any ability to extend the lens. If I remove the USB cable, then extend the lens, then the camera returns to Display/Playback as soon as I insert the cable.
Are you trying to switch using the rec button in the gui, or on the camera itself? The gui button (or entering rec in the console) should work. Normal camera controls are not. If the chdkptp rec button doesn't work, then there's another bug in the port.

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I also noted that inserting the USB cable prevents me from moving back and forth between images in playback mode. I have to remove the cable, press <- or -> to go the the previous/next image, then reinsert the cable.
Sending
=post_levent_to_ui(4484)
in the chdkptp console will probably unlock the playback controls.
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