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blend_image(3) Arcan Lua API blend_image(3) NAME blend_image - Change image opacity. SYNOPSIS nil blend_image( VID or VIDtbl, opacity, time, interp ) DESCRIPTION Changes the opacity of the selected VID s either immediately (default) or by setting an optional time argument to a non-negative integer. This func- tion either accepts single VID s or a group of VID s in a table (iteration will follow the behavior of pairs() Interp can be set to one of the con- stants ( INTERP_LINEAR , INTERP_SINE , INTERP_EXPIN , INTERP_EXPOUT , IN- TERP_EXPINOUT , INTERP_SMOOTHSTEP ). NOTES 1 VID s with an opacity other than 0.0 (hidden) and 1.0 (opaque, visi- ble) will be blended. 2 Values outside the allowed range will be clamped. 3 The blend behavior is dictated by the default global blendfunc value (src_alpha, 1-src_alpha) and can be overridden with force_im- age_blend(mode) EXAMPLE function blend_image0() a = fill_surface(128, 128, 255, 0, 0); b = fill_surface(128, 128, 0, 255, 0); move_image(b, 64, 64); show_image({a,b}); blend_image(b, 0.5, 100); end MISUSE function blend_image0() a = fill_surface(128, 128, 255, 0, 0); b = fill_surface(128, 128, 0, 255, 0); move_image(b, 64, 64); show_image({a,b}); blend_image(b, -0.5, -100); end MISUSE function blend_image1() a = fill_surface(128, 128, 255, 0, 0); b = fill_surface(128, 128, 0, 255, 0); move_image(b, 64, 64); show_image({a,b}); blend_image("a", 0.5, 100); end MISUSE function blend_image2() a = fill_surface(128, 128, 255, 0, 0); b = fill_surface(128, 128, 0, 255, 0); move_image(b, 64, 64); show_image({a,b}); blend_image({-1, "a", true, 5.0}, true, "error"); end SEE ALSO: image_force_blend(3) image August 2026 blend_image(3)
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