Trouble with image colors

[jarvis24]

Can you post or send me a copy of the style (.drt) file and input file you are using and also a copy of your system diagnostics via dxdiag? Instructuctions for the latter are here: www.empirisoft.com/Support/showthread.php?t=75

Will take a look and see if I can tell what's up with it.

-Blair

[solomon]

Thanks for your time. Here are the attached files.

[jarvis24]

Your dxdiag file looks fine although the driver for your video card is pretty old (2000) you may want to try an update if you can find one.

Some questions..

Does the same effect occur for any of the DirectRT samples that use images, e.g.,

C:\DirectRT\Samples\4 applications\image priming\implicit.csv

If it's unique to this study you are running, I'd be curious to know if the images from the sample above look washed out when used in your study. Or, if the images in your study look washed out when used in that sample.

[jarvis24]

I looked at your files again. You are using 24-bit images with many shades of grey against a grey background. I'm assuming you want the image to blend into the background. DirectRT uses 16-bit colour by default--the impact this has on images is usually minimal and is worth the savings in processing load.

In some cases though, 16-bit colour can adversely affect image quality. When this happens (as it also does with videos/movies on occasion), you can tell DirectRT to use 24-bit colour by placing a simple text file with the number "24" in it in your experiment folder. Call the file "colour.txt". I've attached a sample of such a file. Doing this will preserve 100% of the quality of your 24-bit images. Note that "32" will also work if your system prefers that.

Note that another strategy would be to reduce the number of colours in your images to 256. Irfanview has a function for this and does a nice job (see Image > Reduce Color Depth).

Finally, if you want your picture to blend in perfectly with the background, you might create a background image of the colour you want and display the subsequent picture over top of that so the match is exact. Some systems vary in how they display colours as set in the style file.

The super perfect fix for your study, I expect, will be to keep your images as is and use the 24-bit (or 32-bit) colour.txt function in combination with a background which is a full screen grey image.

Hope that helps,
-Blair

[apires]

Hi!!
I need that the background screen be the same grey of the image. First, I did change my images to the same colour of the screen (grey 9539985). But I don't know why I cannot make it similar, and I need my images to create apparent movement so they must have the same color than the background screen. I prove changing it to 12 colors and didn't work. Also i downloaded the color.txt but direct rt told me that this computer is not able to use the 24 colors. And also i've changed my screen preferences and nothing changed..
Please, can you give some advice??

Here i attach the style file and 2 images as example

[jarvis24]

I could but could you revise your attachment so that it includes your input file and copy of the colour.txt file? That way I'll try to replicate exactly what you are getting and try to suggest a few options. e.g., as suggested above--did you try using a .bmp image as a background in addition to (or instead of) using a grey background in the drt file?