[DOSSIER] Réglages photo et vidéo du Desire HD

Voilà un dossier assez complet sur la photo et vidéo avec le Desire HD
Merci à Thanks Meter 63 (oui je sais merci à merci ) qui a posté ce dossier.
SOURCE XDA


1.72.405.3_R2 Update: improve system performance and camera feature enhancements

A lot of people even reviewers have been complaining about the camera
quality, however the Desire HD boosts a good 8 mega pixels senor, you
can achieve great results if you know your way around it.
I will start this guide by showing some tasty examples since this thread is all about photo quality please don't complain about photo sizes as its meant to be examined.

The main rules as in the follwoing photos:

Disable digital sharpness so it’s set to -2 or reduce it to -1 if you feel its too soft but never sharpness 0.
Manually set your focus, wait for the focus signal to turn green, keep
your hand steady until the shot is taken (keep it till the preview
appears)
and of course always make sure the camera protection glass is wiped clean.

Taken at 8 mega pixels, sharpness -2, everything else is default
Contrast/exposure/saturation 0, ISO auto, White balance auto and Flash
is off.
These are from first attempt and untouched It’s just Flickr resizing them. Flickr limits the size to 1k so I will try to attach the full scale images in zip files.







Larger: http://www.flickr.com/photos/5693012...7625450976523/

As you can see these photos look great and natural, two things the
Desire HD camera excels at, color reproduction and marco shots which
works automatically as long as you set your focus correctly.
The main issue we need to tackle with the camera is the sharpness setting.


Image adjustments: Sharpness

• +1 +2: Increases noise reduction and sharpness,
  however it doesn’t appear to change much from the default, the screen
  displays more sharpness but when you examine the photo taken there is
  little difference
  
• 0: Default value, in reality it applies aggressive noise reduction and sharpness
  
• -1: Reduces noise reduction and sharpness.
  
• -2: Disables noise reduction and sharpness completely
  

At default this setting is set at 0 with four other options (-2, -1, 0,
+1, +2) so effectively the default sharpness is actually set at 2.
Like other cameras, at first it attempts to reduce noise by blurring out
fine detail and then attempts to restore detail by sharpening edges.
However it’s all very over done so it introduces lots of blur and
artifacts, even down scaling the image by half leaves it looking
unnatural.



As you can see its pretty bad job at default, it’s a good thing we have
the option to reduce it or turn it off, despite being a little soft-2
looks the most natural and has the most detail.

Recommendation: disable it at -2 so you capture the pure image
taken as by the camera sensor, despite looking a little soft at full
scale it’s still a lot of pixels at 8MP so it will look great when
scaled like on the phone screen, TV, websites like Flickr or even print.

If you want a little more sharpness you can extract more detail by
sharpening it in Photoshop, you can also sharpen it using an app like
PicSay pro which is pretty good but sadly downscales it to 1MP.
By the way some of the effects in the gallery can improve definition and sharpness, more on this later.

Otherwise If you must have some sharpness in the image and willing to
sacrifice some image quality you can set it at -1 which is less
aggressive. But as you can see above even with -1 detail are getting
lost.

Keep in mind taking a photo with the default sharpness applied will
leave little choice to fix it later, since the image details are already
tempered with.


Image adjustments: Contrast, Saturation, Exposure

• Contrast: controls the levels between black and white,
  reducing it will reveal more detail in dark areas but at the loss of
  overall definition.
  
• Saturation: controls the richness of colors, increasing it can reveal more grain.
  
• Exposure: controls brightness, you increase the brightness but risk over exposing an area.
  

Recommendation: leave them at default 0 which is well balanced, unless you see a need to adjust your photo.


White balance

White balance enables the camera to capture colors more accurately by adjusting to your current lighting
environment. White balance settings include: Auto, Incandescent, Fluorescent, Daylight, and Cloudy.

Recommendation: leave it at auto it does a good job, unless your photo appears wrong in the viewfinder.
You can use Fluorescent to fix the yellow colors hue caused by using the Flash.
If you are filming a video indoors set it manually since it’s a little jumpy.


Focus



Auto simply sets the focus at the center of the screen whenever you move
the camera, you can still pick your focus even with auto focus engaged.

If you want properly focused shots without any blur plus good photo
framing you will have to set your focus manually, focus will also adjust
your target exposure.
A slight issue sometimes after you set the focus the handset detects a
slight movement and resets the focus at the center so you need to be
careful.
Unlike previous HTC phones you can no longer keep holding an area to
focus and shoot, you will need to press the capture button after the
focus is set.

Auto focus also has a face detection sub function; it works really well when people are in frame.

Recommendation: Unless you want a quick point a shoot photo
always set the focus yourself, it will insure you get the proper
sharpness plus fix the exposure of your subject.
If people are in the picture face detection will do the job for you. If
you like to insure the focus never mess up turn off auto focus
altogether but you will lose face detection functionality.
Of course always wait for the focus pointer to turn green.


Self Portrait & Self Timer

• Self portrait: If you want your camera to automatically
  take people photos, you can set it to identify 1 or 2 faces and
  automatically adjust the focus.
  
• Self timer: If you need to take a group photo or your own photo, you can set a time delay before your camera automatically takes the photo.
  

ISO, Shutter speed & Flash

ISO determines how sensitive the image sensor is to light, increasing it
will help you get more light in darker settings, however the higher the
ISO the grainier the photo will look.
The Shutter speed is also affected by light sensitivity, so higher ISO can reduce motion blur.



Recommendation: leave it at auto it does a good job of detecting
the needed settings, however if you notice the image is too grainy, too
dark or suffering motion blur you can adjust it manually.
Use an ISO of 100 or 200 when taking photographs outside in sunny
conditions. If the sky is overcast or it is evening time, then use an
ISO within the range of 400 to 800.
Moving subjects will require some ISO and flash consideration to prevent motion blur.


Shutter Speed



The shutter speed in the DHD is linked to the available light, testing
in daylight at low ISO reveals motion blur with moving subjects.
Higher ISO means more light so it will snap moving subjects sharply of course of at the cost of increasing grain in the image.
You can see the difference in the viewfinder by changing the ISO value (in daylight). The higher the ISO the less motion blur.

Recommendation: Compared to other phones the capturing and saving speed itself is pretty fast.
So when capturing moving subjects a good practice is to snap multiple
shots in a raw to make sure you get a good shot, you can disable preview
to make this process faster.
As always insure your hand is steady and wait until the photo is completely taken i.e. wait a little after you press capture.
If you can't be bothered then rely on ISO 400 or 800 to prevent motion
blur with moving subjects. At low light you still have to insure a
steady capture and enable flash to help.


Flash

If it’s very dark you will have to rely on the flash, The good news is
with auto ISO the flash rarely burns your subject and it usually selects
a good ISO.
Flash will also help in preventing motion blur. However flash tints the
image with some green-yellow hue, it can be improved using the following
tricks.

Tips to improve the yellow color tint: Thanks to Elemental_Fire
for the tip! you can get much more natural colors while using the flash
by choosing Fluorescent for white balance.
Remember this white balance tip is only good during flash, if you keep it at fluorescent it might ruin your daylight shots.
Like any other photo you can also improve it by using the auto enhance feature in the gallery effects menu.



Here are some examples of low light performance of the DHD camera




Larger: http://www.flickr.com/photos/56930129@N03/sets/72157625585331314/


Widescreen

To fill the viewfinder 5:3 widescreen aspect is selected by default it
gives a cropped photo at the size of 3264x1952, while disabling it
produces a full 8 megapixels 4:3 photo at 3264x2448

Recommendation: Leave it disabled, you are loosing lots of pixels
with 5:3, even better when widescreen is disabled the viewfinder
actually runs smoother.


Gallery Effects

A very nice feature included in the new sense, it allows you to further improve your photos from within the gallery.
On the Gallery app’s Albums screen, tap an album > Press and hold
on the photo that you want to add effects to > In the menu that
opens, tap Edit, and then tap Effects.
There are too many to list but auto fix will improve the colors and
contrast of your photo, while effects like high contrast will add an
artistic vignette and increase the sharpness of your image, of course
you can also apply them over each other.
It works at native 8 mega pixels photo without badly recompressing it.

Here are some examples (original, auto enhance, high contrast, lively and overexpose)



Larger: http://www.flickr.com/photos/5693012...7625585449676/


720p Video recording

Zooming is not available in 720p mode but you can change focus while filming.
In good to ok lighting conditions, the Desire HD films at 30fps, but it can drop to 20 fps and as low as 10fps if its dark.
Filming at 800x480 results in better frame rates in case of low light and allows you to zoom in while filming.

The video encoding is good at 8MB/s baseline mp4 level 3.1 but the audio
is badly compressed at 8 kHz 32 kbps! Maybe to improve performance…

Recommendation: The main issue with photos applies in 720p, the sharpness setting at default 0 is pretty bad especially with filming people.
Unlike photo mode, setting sharpness to +1 or +2 makes a visible increase in sharpness.
The video will be full of artifacts and jaggies unless you disable it
with sharpness -2 or lower it at -1 if you really like sharpness.
If you are filming indoor manually select your white balance, with auto its quit jumpy and keeps changing while filming!



https://www.youtube.com/watch?v=c2uK6uk5MIw&hd=1

The above video recorded 30fps at sunset without any lag, using auto
ISO. Keep in mind when you upload to YouTube it re-encodes the video

720p lag issue: [issue appears resolved with the 1.72.405.3 update]
It can be solved by killing tasks before recording, use an app like free
advanced task manager hit end all and then launch the camera app.
Some people have said formatting the SD card with 32k cluster size will
help but I found no solution other than killing tasks before recording, I
have the bundled class 2 microSd and it works every time.

Tips to improve FPS in low lighting conditions: Turning the Flash on can bump the frame rate back to 30fps.
This works especially well indoors since the flash will help on boosting
the available light, in outdoor darkness the flash can offer little
help since its has a limited range.
Another tip to keep in mind is ISO mode, boosting the light sensitivity
can help increase the frame rate, although by default auto ISO takes
care of it pretty well.
You can't select the ISO level while in video mode but you can force it
in photo mode, of course this will also result in a grainier image.

more samples here from solopalmari.com https://www.youtube.com/watch?v=CNtZSgcaToY


Finally the fun part

Desire HD vs Desire vs iPhone4

The iPhone4 has a very good sharpness algorithm, which is quite similar
to what you can get with Photoshop. Its great outdoor but fails badly in
indoor daylight lighting.
It extracts a lot of noise, perhaps the sensor is working at a very high
ISO and unlike the Desire HD you can't adjust any of this.
In case of 720p recording iPhone 4 is clearly the winner, it always films at 30fps even in low light (with lots of noise).
The flash on the iphone 4 is simply fail but in the other hand it has a
very nice HDR mode. Finally color reproduction on the DHD is better,
colors with the iphone4 are adjusted and unreal.



To conclude the DHD has a quit good camera, its only the HTC added
sharpness failing, fortunately it can be solved by disabling or reducing
it.
Deal with sharpness, understand ISO, set framing and focus right and you can achieve great results.
Testing with the Vignette app reveals the HTC camera produces much
better captures while camera 360 pro still doesn't support the DHD
properly.
Finally don't forget to experiment with the effects feature in both the camera and gallery which are really impressive.

I will try to attach the full scale 8MP samples when i get some freetime, feel free to post your success stories or questions

have fun!

Dernière édition par DEDO le Mer 9 Mar 2011 - 23:16, édité 1 fois

Le dossier est assez complet
je l'ai pas traduit mais il y a beaucoup d'images
Noter que ses réglages de bases sont
Netteté à -2 voir -1 mais jamais zero
Saturation Contraste et Exposition à zero
Iso sur auto
balance des blancs sur auto
Flash sur OFF
Focus en manuel, attendre que le signal passe au gris et faire la photo sans bouger jusqu'à l'apparition de la prévue

Franchement j'ai un vrai problème avec les photos, l'autofocus est vraiment trop lent et c'est impossible de prendre une photo si la personne bouge un peu
On dirait que je retrouve l'appareil photo du HTC Hero qui était vraiment bof bof, l'autofocus (si c bien ca) était largement meilleur sur le HD2 et Désire normal, c'est bien dommage.
Pourtant j'ai fait ce que le guilde conseil

Bof bof en netteté -2 il trouve plus de details mouer je trouve sa très flou moi

Pareil toujours pas réussi à avoir de belles photos

Moi je trouve la qualité bien meilleur depuis que je suis sous cyanogenmod. Mais rien d'exceptionnel sa reste un téléphone