пн, 26 сент. 2022 г., 21:27 Phyllis Smith <[email protected]>:
> > may be Phyllis can replace our original red-green square images with >>>>> full-color gradients + photo, so effect will be more natural? Or add this >>>>> into new appendix ..... >>>>> >>>> Good idea to add in appendix but I am not sure I could get it right. >>> >> >> >> may be download images from said website via "download" button, then >> place them on tracks and render single frame for each of those 30 >> different composition modes on top track? sorry if this sounds big, I can >> try this idea myself, just then I will generate whole folder of images for >> you to pick up and integrate into manual. < oh Andrew, come on, you just >> too lazy for even minimal work - my conscience > >> > > It does sound big but quite interesting to me and not a problem with TeX > editing. I think I will have time in October to get serious and then have > you proofread? > OK! looking forward to October then. >> or you mean whole TeX editing? I should try to retest if my pdf >> generating setup still work .... >> >> >> >>> >>>> more documentation, it seems Adobe products use shared code for this >>>> .... >>>> >>>> >>>> https://www.rippletraining.com/blog/final-cut-pro-x/understanding-blend-modes-final-cut-pro/ >>>> >>> Another good URL to look at. When coding all of the Overlay modes, >>> Porter Duff explanations and example were used as the basis. Not sure if >>> Gimp and PhotoShop use the same basis. >>> >>>> >>>> >>>> --quote--- >>>> >>>> Subtract >>>> >>>> Subtract does what it advertises; the color values of one layer are >>>> subtracted from the other layer. This tends to have a net darkening effect. >>>> Pixel values can’t fall below zero, so negative numbers are rendered to >>>> black. >>>> >>>> >>>> ---end quote--- >>>> >>>> >>>> in older cingg code (from 4.6.mod era - earliest public code on Google >>>> code) I see such construct : >>>> >>>> >>>> /data/data/com.termux/files/home/cingg-g~nelerra-4.6.mod/cinelerra/overlayframe.C >>>> 4762/69317 UTF-8 6% >>>> >>>> break; \ >>>> >>>> case TRANSFER_SUBTRACT: \ >>>> >>>> r = (temp_type)output[0] - (temp_type)input1; \ >>>> >>>> g = ((temp_type)output[1] - >>>> (temp_type)chroma_offset) - \ >>>> >>>> ((temp_type)input2 - >>>> (temp_type)chroma_offset) + \ >>>> >>>> (temp_type)chroma_offset; \ >>>> >>>> b = ((temp_type)output[2] - >>>> (temp_type)chroma_offset) - \ >>>> >>>> ((temp_type)input3 - >>>> (temp_type)chroma_offset) + \ >>>> >>>> (temp_type)chroma_offset; \ >>>> >>>> if(r < 0) r = 0; \ >>>> >>>> if(g < 0) g = 0; \ >>>> >>>> if(b < 0) b = 0; \ >>>> >>>> r = (r * opacity + output[0] * transparency) / >>>> max; \ >>>> >>>> g = (g * opacity + output[1] * transparency) / >>>> max; \ >>>> >>>> b = (b * opacity + output[2] * transparency) / >>>> max; \ break; >>>> \ >>>> >>>> >>>> --- >>>> >>>> >>>> so it basically had specific guard against going negative. Not sure if >>>> our implementation does the same just in different place? >>>> >>>> >>>> I see no specific handling of it in macros ... >>>> >>>> >>>> >>>> overlayframe.h [----] 38 L:[ 53+ 0 53/615] *(1572/17155b) 001[*][X] >>>> >>>> // ADDITION<--->[(Sa + Da), (Sc + Dc)] >>>> >>>> #define ALPHA_ADDITION(mx, Sa, Da) (Sa + Da) >>>> >>>> #define COLOR_ADDITION(mx, Sc, Sa, Dc, Da) (Sc + Dc) >>>> >>>> #define CHROMA_ADDITION COLOR_ADDITION >>>> >>>> >>>> // SUBTRACT<--->[(Sa - Da), (Sc - Dc)] >>>> >>>> #define ALPHA_SUBTRACT(mx, Sa, Da) (Sa - Da) >>>> >>>> #define COLOR_SUBTRACT(mx, Sc, Sa, Dc, Da) (Sc - Dc) >>>> >>>> #define CHROMA_SUBTRACT COLOR_SUBTRACT >>>> >>>> >>>> but apparently you can add some comparing here ...just .. it went from >>>> two-stage process to single stage for untrained eye and I am not sure where >>>> to put those ifs? >>>> >>>> >>>> >>>> >>>> >>>> >>>>> >>>>> вс, 25 сент. 2022 г., 11:06 Andrew Randrianasulu < >>>>> [email protected]>: >>>>> >>>>>> I found Graphics-softlight mode behaving visually close...but not >>>>>> sure how close to CinHV/CV subtract mode ... >>>>>> >>>>>> >>>>>> >>>>>> вс, 25 сент. 2022 г., 10:24 Andrew Randrianasulu < >>>>>> [email protected]>: >>>>>> >>>>>>> I was trying to repeat tuto at >>>>>>> >>>>>>> https://linuxvideoediting.blogspot.com/2022/01/transparent-text-effect-in-Cinelerra-part1.html?m=1 >>>>>>> >>>>>>> >>>>>>> so I loaded video, created empty new vid track, applied 'titles', >>>>>>> 'blur' and 'invert video' to _empty track_, then set track's mode to >>>>>>> subtract .... result was color inversion of original video on second vid >>>>>>> track ( >>>>>>> >>>>>>
-- Cin mailing list [email protected] https://lists.cinelerra-gg.org/mailman/listinfo/cin
