> 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? > > 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 ( >>>>>> >>>>>
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