does cropping cause a downgrade in image quality

[vthev1]

Hello,

My pc:
Motherboard: Tyan-Trinity 450(Via Apollo Pro 133a Chipset)
DMA set properly due to the Q&A
Processor: PIII 1.0 Ghz
Memmory: 512 mg PC133
Harddrive: Maxtor 60GB
Video: ATI Radeon 7500
Audio: Creative X-Gamer Live
OS: 98 SE
I use DVD2SVCD 1.0.8 build 1

I am working with a ntsc 2.35:1 widescreen letterbox movie and I am trying to add a proper crop to view it on a 4:3 tv. I add a crop of (30,60,660,360)without adding borders to the avisynth script and it works o.k. for me. The image even look's proportional. But what I am wondering is the grainy texture I am seeing. Is this being caused by the crop or do I need to look further into what might be causing my problem.
Thank you:)

[Hanty]

crop has no impact on image quality. You are only "screening" out the parts you don't want.

[Kedirekin]

Not sure what other commands you have in your script. Also not sure what you're going to, but I'd guess to SVCD, which means a resize to 480x480 or 480x576.

In either case, you'd be scaling 360 up to a higher resolution, which could result in pixelation, or could make the inherent graininess of the movie more apparent. If you aren't already using BicubicResize, you should probably switch. And beware the defacto standard (x,x,0,0.75) setting - that will probably result in a sharpening of the grain. I'd try (x,x,0,0.5), which is slightly softer, or even (x,x,0.33,0.33) which is a lot softer (about as soft as BilinearResize, in fact - but don't use Bilinear; it isn't good for up-scaling resolutions).

[vthev1]

Thank you gentlemen for the replies,
Kedirekin,
I always forget to write something, and I guess it would be important to know I am making svcd. Sorry! I have been using BicubicResize(480,480,0,0.75&0.55) but not the one's you suggested. Thank you for the advise and I'll give it a try.:)