Rob.Screene
Prominent Member
I thought I would post up some experience I gained over the last few months at calibrating my JVC X3 in a dedicated room, cocoa brown walls and a Black Widow high contrast DIY screen.
I hope this helps others with half-life bulbs in such JVC's and shows what the models missing ISF colour correction features can achieve. Your comments and questions appreciated.
The projector is around 2 years old and 798 hours on the original bulb. I had noticed a little loss of brightness and punch and that skin tones looked a little unhealthy.
I bought an i1 Display Pro 3 meter, with the pro corrections option and ChromaPure software from Kalibrate, as well as ordering a genuine replacement bulb from Alan at Ideal AV. I believe it's the same bulb used from the X3 through to the X90.
Let's say I am delighted with the results, black levels, contrast and colours now look fantastic...
1. I set about practicing measuring and correcting the original 798 hours bulb:
The Before graph shows Red low and losing brightness, with blue too high. I dropped the Blue and Green gains to align around 50% stimulus and the Cuts. Although better greyscale by far, the After picture just was not right. And the new bulb had arrived!
2. With a new bulb in for 17 hours, I did a factory reset and got here, using the gains but not yet realising the potential of the 10-point RGB gamma correction on the X3:
3. Here is 70 hours, where I did a second go, Aiming for just under a delta E of 3 using the gains/cuts, focussing keeping green good and not worrying about gamma or 100% stimulus being too blue. I also used the JVC 10-point white gamma correction to get a solid 2.2. gamma curve, then using the 10-point red and blue adjustments to finely correct the colour balance at both the ends:
Here is the greyscale delta E's all under 3, most points under 2:
Finally here is the Chromaticity, of which I have only colour and tint to be able to adjust and otherwise no control of with an X3 itself. Red and Blue and the Magenta, Cyan and Yellow secondaries are all pretty bang on the reference squares, with Green slightly toward yellow:
I hope this helps others with half-life bulbs in such JVC's and shows what the models missing ISF colour correction features can achieve. Your comments and questions appreciated.
The projector is around 2 years old and 798 hours on the original bulb. I had noticed a little loss of brightness and punch and that skin tones looked a little unhealthy.
I bought an i1 Display Pro 3 meter, with the pro corrections option and ChromaPure software from Kalibrate, as well as ordering a genuine replacement bulb from Alan at Ideal AV. I believe it's the same bulb used from the X3 through to the X90.
Let's say I am delighted with the results, black levels, contrast and colours now look fantastic...
1. I set about practicing measuring and correcting the original 798 hours bulb:
The Before graph shows Red low and losing brightness, with blue too high. I dropped the Blue and Green gains to align around 50% stimulus and the Cuts. Although better greyscale by far, the After picture just was not right. And the new bulb had arrived!
2. With a new bulb in for 17 hours, I did a factory reset and got here, using the gains but not yet realising the potential of the 10-point RGB gamma correction on the X3:
3. Here is 70 hours, where I did a second go, Aiming for just under a delta E of 3 using the gains/cuts, focussing keeping green good and not worrying about gamma or 100% stimulus being too blue. I also used the JVC 10-point white gamma correction to get a solid 2.2. gamma curve, then using the 10-point red and blue adjustments to finely correct the colour balance at both the ends:
Here is the greyscale delta E's all under 3, most points under 2:
Finally here is the Chromaticity, of which I have only colour and tint to be able to adjust and otherwise no control of with an X3 itself. Red and Blue and the Magenta, Cyan and Yellow secondaries are all pretty bang on the reference squares, with Green slightly toward yellow:
Last edited: