Color difference in PC and Television

[Premjit V.P.]

I clipped images to 352 x 288 size and created a Photo-VCD using Tmpgenc. My setting were not standard, but my DVD played with utmost clarity just with a few MB of Video. (135 images of 5 seconds each totalled only 10 MB VCD space). The setting were

1. VBR mode
2. Frame rate 0.2 (internally 25 i.e., 25/125)
3. Audio at 32 kbps (but no source audio fed)
4. Input files obviously were serially numbered Images (352x288 size)

The colour of the Images in the television looked differently (as if a grey-scale image of itself was blended with the original image). I tried decreasing Contrast 0-base and increasing the Saturation (in effects tab of Tmpgenc) and the results were overwhelming, but not 100% similar. IS THERE ANY WAY TO EXACTLY CORRECT THIS COLOR DIFFERENCE?

The Image clipping program was written by myself and would like to give to anyone on request. Please mail to to premjit_vp@rediffmail.com with the subject as "request "
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[BJ_M]

check or uncheck output YUV data as basic YCbCr not 601

(i can t remember which but do the opposite of what you had)

[Premjit V.P.]

Sorry BJ_M, your advice did not work. I still had to touch the Saturation Tab of tmpgenc. Please give me your email id; mine is premjit_vp@rediffmail.com

[fmctm1sw]

Please give me your email id

Me too Craig. I got a couple of porn sites I need to sign up with.

[trevlac]

IS THERE ANY WAY TO EXACTLY CORRECT THIS COLOR DIFFERENCE?

Probably not. You should try to preview work on a broadcast type monitor if you can.

As you have noticed, a TV and a PC are different viewing devices. Generally TVs are Brighter than PC monitors. Your problem sounds the reverse.

If you delve into the topic, you will see that there are a lot of details to be taken into consideration.

• What are your PC monitor's adjustments?
• What is the encoder doing (BJ_M's) guess?
• When you preview on the PC, what is that program doing to the color/gamma?
• What are the levels of your TV
• What kind of gamma is set
• How dark is the room (no kidding here)
• Is your dvd player working properly?

BJ_M's point about the encode option was a good shot. The 601 spec (which is used by DVD) states that the luma range should be 16-235. The default setting in TMPGEnc assumes your input is in the range of 0-255. If it is 16-235, TMPGEnc will further compress the range (making it look washed out). To keep this from happening you pick the basic option. IIRC, jpeg uses the range 0-255, but it is hard to say what your input would be.

Post a sample input photo and pull the same one out of the mpeg and post that.

Here is some fun reading ...
http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html

Gamma is one of the reasons TVs and PCs look different.

[Premjit V.P.]

Ok trevlac, I will do that. But before that, do you have any idea of what the professional software like Dvdpictureshow etc., are doing? Do they correct this problem? I have experimented with Slide Show Movie maker and Photo2vcd and they too have brought the same results (as my query in the first post)

[trevlac]

Ok trevlac, I will do that. But before that, do you have any idea of what the professional software like Dvdpictureshow etc., are doing?

Nope.

[Premjit V.P.]

Sorry Trevlac, I am not allowed to post Images bigger than 50kb in this Website ( ). But I have noted your valuable points of previous post, which if taken care, will surely minimise my problem of Color difference. Thank you very much.