JVC DLA-RS4910 Projector Review – Calibration and Settings

On this page we will repeat some of the measurements taken by Mike when he calibrated the projector.  That way, on this page, you  have both the calibration settings we used, and the effect they have on the JVC DLA-RS4910 projector’s measurements.

At the bottom are some of Mike’s comments from measuring and calibrating the DLA-RS4910 projector.

JVC DLA-RS4910 Color Temperature

Lumen Output and Color Temp at 100 IRE (mid zoom):
Cinema1235 @ 6427
Natural1205 @ 6421
Stage1285 @ 6812
Animation1285 @ 6811
User 1-41205 @ 6240

Lumen Output (Low Lamp, Animation mode): 843

Color Temp over IRE Range, Best mode (Pre calibration)
Cinema (User and Natural are very similar)
30 IRE6272
50 IRE6360
80 IRE6454
100 IRE6427
JVC DLA-RS4910U Pre-calibration – Settings for measurements (default values are in parenthesis):
CinemaNaturalStageAnimationUser 1-4
 Color Sat.=(0)(0)(0)(0)(0)(0)
 Tint = (0)(0)(0)(0)(0)(0)
 Color Temp =(6500)(6500)(7000)(7000)(6500)
Gamma =(Grad. Priority)(Normal)(Bright Priority)(Cont. Priority)(Normal)
Color Profile =(Cinema)(Standard)(Stage)(Animation)(Standard)
Lens Aperature =(Auto 2)(Auto 1)(Auto 2)(Auto 2)(Manual – fully open)

Lamp Mode=High (unless noted otherwise).

All other settings at default (untouched)

Color Temp over IRE Range (Post calibration):
20 IRE6440
30 IRE6428
40 IRE6559
50 IRE6426
60 IRE6455
70 IRE6486
80 IRE6495
90 IRE6461
100 IRE6467
 Average gamma = 2.22
Effect of zoom on lumen output (Animation mode):
Zoom out1388
Zoom in1132


Effect of Lens Aperture setting on lumen output (Animation mode):
0 (maximum opening)1285
-7 (half open)974
-15 (minimum opening)633
Calibration settings for User 1:
User 1, Custom Color Temp 1 w/ 6500 starting point
Gain (0)NOTE: Gain can only be adjusted downR = 0
G = 0
B = -3
Offset (0)R = -4
G = -6
B = 7
 Lumens at 100 IRE: 1235 @ 6467

NOTE: Gamma on Custom1 – 2.4 starting point, Color Profile on Standard, Brightness on 5

Mike's Performance Notes

This is the brightest JVC projector to date, far exceeding the previously reviewed X35 and X55.  It is equally bright in all modes, with only a 6% drop from Stage or Animation modes to Natural or User modes.  Like previous JVC projectors, grayscale is decent right out of the box in Cinema, User or Natural modes.  Also typical of JVC projectors, gamma was too low in the Normal preset, averaging right around 2.0.  Going to the Custom gamma allows for an average gamma of 2.2 or higher

Mike's Grayscale Calibration Notes

Grayscale calibrated reasonably well, with an average Delta E of only 1.4 and nothing higher than 2.6.  The RGB balance was also good and other than a bump at 50 IRE, was consistent across the whole IRE range.  As with past JVC projectors, adjusting Gain has an effect on the total IRE range, whereas Offset has little effect on upper IREs.  So, if you adjust Gain, then compensate for the adjusted gain effect with Offset, it works out pretty good. 

Again, as with prior JVC projectors, I used the custom gamma of 2.4 to achieve an overall gamma of 2.2 or higher.  This results in a pretty smooth gamma with an average of 2.22.  Luminance tracking is quite good as well.  Using the 2.4 gamma setting tends to crush blacks a little, so increasing the Brightness setting to 5 is necessary.  This projector has some newly described gamma settings (as compared to past JVC projectors), but they appear to be similar to the previous A, B, C and D gamma settings.  

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News and Comments

  • ozvids

    Art, what screen size, format and type are you using to get your measurements from?
    The screen details will dictate the lumen output and everything else.eg. I wont get 1230 lumens in cinema mode on a 160 inch screen with a completely different throw. cheers.

    • ProjectorReviews.com

      Hi Ozvids,

      I think we should start by correcting a misconception. Lumens is a constant – a measure of brightness of the projector. You don’t get 1230 lumens at a screen size, you just get 1230 lumens. The size of the screen will determine the ft-lamberts – the amount of brightness of that light hitting the screen. The larger the screen, the less ft-lamberts given the number of lumens. If you have, say 1000 lumens hitting a 100″ screen, you would need 44% more lumens to be equally bright on a 120″ diagonal screen. (rule of squares – the 120″ screen would have 44% more surface area, so you need 44% more lumens for the same brightness.

      A quick rule of thumb – for movie theater level brightness (typical is 16 ft-lambert), if you have a 100″ diagonal screen with a gain of about 1.1, you need around 400 lumens (that’s a quick number off the top of my head). You’d therefore need about 570 lumens for that larger screen. So, both screen size, and screen gain make a difference.

      The basic formula for ft-lambert and lumens: foot-lamberts = lumens / screen area (measured in sq ft). This does not factor in the screen’s gain, or some other minor factors. If a screen has a gain of, say 1.2 instead of 1.0, then you’d need 20% less lumens to have the same brightness.

      Hope that helps. -art

      • ozvids

        Thanks Art, yes i had my wires crossed there. But your calibrated settings will be screen dependant so will the size to a degree right?

        If you had a screen that had a blue push for example, you would need to compensate by pulling the blue out of the projector somewhat (perhaps other things too). You have 2 screens on display right? One is a studiotek 130 and the other a carada brilliant white ? is that right? So one would be spectrally flat, the other not so accurate. Good to hear you like the JVC anyway, she’s a corker of a machine I have one here in oz.