laila_breakaleg Hi
1/ Image Show GK4 supports different content types and it offers settings for each slide separately so it doesn't support to show gallery from a specific folder at this moment.
2/ I removed the linear-gradient in image via this file: \modules\mod_image_show_gk4\styles\gk_academy\engine.js
Line 37:
var newDiv = new jQuery('<div title="' + elm.attr('title')+'" class="gkIsSlide" style="'+elm.attr('style')+'; background-image: linear-gradient(0deg, rgba(22, 34, 56, 0.5), rgba(22, 34, 56, 0.5)), url(\'' + elm.attr('src') + '\');'+'"></div>');
change to:
var newDiv = new jQuery('<div title="' + elm.attr('title')+'" class="gkIsSlide" style="'+elm.attr('style')+'; background-image: url(\'' + elm.attr('src') + '\');'+'"></div>');