I am currently uploading 24-bit BMP files to the lightcrafter evaluation module. Does the lightcrafter kit apply a gamma correction when displaying bitmaps with the projector? Basically, is the time the DLP mirrors are on linearly correlated with the 8-bit values in the bitmap? Or is there some other function that maps the DLP mirrors "on time" to the values in the bitmap (presumably a gamma correction function)? If it is a gamma correction function, what value of gamma is used?
Hi Ray Wilhelm,
Apologize for delayed reply to your query.
Welcome to DLP & MEMS forum.
I presume you are asking question when LightCrafter(TM) is configured in Display Mode = Static Image. And then you are uploading a 24-bit BMP image from 'Static Image' section under 'TestPattern/Image' tab. Yes, in this mode, the de-gamma correction is applied. So you should NEVER use this mode for checking for Linear Correlation of DLP mirror with respect to input 8-bit value of the input image. The degamma correction resemble 'S' curve so I don't have direct degamma number to share with you.
Attaching the curve plot for your better understanding.
Note, the DLP Mirrors are linearly correlated when LightCrafter set to Display Mode = Pattern Sequence where you can program the patterns and display them at user selectable 'exposure timings' and frequency. Features like degamma correction and other image enhancement functional blocks inside DLPC300 will be turned OFF by DM365 processor. So, DM365 takes care of ensuring 'linear correlatable' data path is maintained whenever user selects Display Mode = Pattern Sequence.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.