Posted By
IstvanV
on 2008-07-09
07:35:11
|  Re: plus4emu FLI converter
> I could play a lot with the setting on hue and the search method.
Actually, those only affect the hires modes. For multicolor, the settings that do have any effect are all those that are on the first page (but Vertical resolution and X shift are for FLI modes only), and Use 1 bit luminance and MC chrominance error scale from the second page, as well as the C64 palette when reading .koa or .ocp files. The other 'advanced' settings are used only by the hires conversion.
On the other hand, hires modes ignore the "multicolor" parameters, unless the MinRMSErr_YUV_Downsampled search mode is set. The luminance/color interlace settings are used only by "Interlaced hires FLI", but not in the above mentioned search mode.
Perhaps I should write detailed documentation to explain the various options, as some of them may not be very intuitive, but it could also be a good idea to change the GUI to make options that have no effect in a particular mode inactive/"greyed out".
> Your emulator eg. shows much more exactly the FLI pictures.
Which is expected since the converter uses plus4emu for displaying the preview (you can also see a BASIC screen if you click preview while there is no image loaded  ), and the palette is also the same.
> By the way, only on the Emulators the FLIs "jumping/wobbling", or on the original PLUS/4 also?
Do you mean the flickering effect in interlaced modes ? That is normal, since interlace works by showing two alternating pictures with one being offset horizontally (multicolor) or vertically (hires) by a half pixel for virtually doubled resolution. Interlacing can make the selection of dither mode tricky sometimes, since the dither patterns can degrade to ugly flickering artifacts (particularly Floyd-Steinberg in interlaced multicolor FLI).
However, the flickering may be worse in emulators, since the monitor refresh rate is usually not an integer multiple of the Plus/4 vertical refresh rate (49.86 Hz), resulting in uneven/jittery flickering. In plus4emu, there is a special "resample to monitor refresh rate" mode that can be used to make the display of demos much smoother, but this is not recommended for other usage like programming, since it adds latency to the video display, makes the controls laggy, and increases the CPU usage.
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