Camera Raw Loses Saturation, Especially Reds

Question

I'm using PSE 5 and ACR 4.3 on Windows. My camera is a Canon 350D and I shoot RAW+JPG.
The problem I have is that photographs with deep/bright reds don't open properly in Camera Raw, but end up "washed out", so I have to really boost the saturation and play around with the white balance to get the reds back. The JPG file which I shot at the same time is absolutely fine, although sometimes the red channel is clipped.
For example, look at the car in the following JPEG. This was taken with auto white balance, and is a fair representation of the actual colour of the car:
Now look at ACR's attempt to open the corresponding RAW file. You can see how the red of the car is much more muted, and a yellower tone:
Can anybody help, and explain how I can get back to nearer the colours captured in the JPEG?
Thanks
Andrew

Answer 1

The issue of the reds in some raw files was recently discussed here:
http://www.adobeforums.com/webx?128@@.3bb6a869.3c0530a0
It's long thread that boils down to something like this:
First, a caveat: there is no antagonism or criticism of any poster intended in my replies to this question. All my replies to posts on this issue are meant to stress that any differences between an ACR conversion and the conversions performed by the camera manufacturer's software may be normal, expected behavior.
If anybody prefers the camera manufacturer's conversion, that too can be emulated in ACR and saved as your own ACR defaults or preset(s). This has been covered ad nauseam here by others as well as by myself. Please do a forum search. If only my posts show up, it means the others have scrolled off already.
Here's the scoop:
Camera manufacturers, Canon and Nikon in particular, perform in-camera RAW to JPEG conversions designed to generate the over-saturated, over-contrasty and over-sharpened images that appeal to the masses.
Their stand-alone RAW conversion software also performs the same conversion to your RAW images.
Noise is also hidden by compressing the shadows so you don't see much of the noise inherent in the image.
In my experience, even the nominally "natural" default settings in these cameras and in the manufacturer's software perform these adjustments to the images, to a lesser but very real degree.
Adobe Camera Raw, ACR, on the other hand, comes with default settings designed to give you the most detail possible (even if this sometimes means revealing some of the noise hidden by the camera manufacturers in their RAW conversion software), as well as the most natural images.
This is only your starting point in ACR.
You can calibrate your camera to ACR and come up with your own settings to produce exactly what you want, including the JPEG-look of the camera manufacturer, and save that as your profile.
The key is to learn how to use ACR properly and to calibrate your camera to ACR.
CLICK HERE for some essential reading.
The ACR defaults are nothing more than a suggested starting point.
The color temperature won't necessarily match either.
These are not
"changes" to the raw file. All raw files are very, very dark, linear, grayscale image with no colors. There is color information included, from which any and all raw converters must create the colors in the converted image according to the parameters of the design of each converter.