Archived from groups: alt.video.laserdisc (
More info?)
On 4 May 2005 19:16:43 -0700, "n$a" <nsa@dk.catv.ne.jp> wrote:
>BrianL wrote:
>>
>> Those white dots when on still frames...do they appear as color? I
>had a
>> CLD-D703 for a short period of time and I played some discs and when
>those
>> white dots were on "still", they had color. But when playing, they
>> appeared white. ??.
>
>It is hard to tell the color of one dot that appears in one frame when
>running at speed, it looks like "speckling". To diagnose rot you have
>to still and step through frames.
>
>> I do have a few discs with green/orange/pink dots like
>> shown in the photo, but strangely in all cases it is not bad. There
>is
>> like ONE colored dot that scrolls horizontally from right to left
>across
>> the screen, and then repeats from the right side again. It does this
>a few
>> times, and then the disc is perfect for the rest.
>
>Rot is random by nature. If your dot is moving in a "logical" way, i
>think it has to be some other problem: at the source, from the
>transfer, during the manufacturing.
Nope. A mark moving across the screen and dropping down line by line
is still either rot or inclusion. It is a failure that extends across
several "grooves" (or parts of the spiral) but unless the disc is CAV
the spiral won't line up, the side by side parts of the spiral are not
of exactly the same part of the picture scan. These were a common
artifact with Discovison and do turn up on unrotted discs where a bit
of dirt may have been caught under the laminate.
... Steve .