diff --git a/libs/ui/opengl/kis_opengl_canvas2.cpp b/libs/ui/opengl/kis_opengl_canvas2.cpp
--- a/libs/ui/opengl/kis_opengl_canvas2.cpp
+++ b/libs/ui/opengl/kis_opengl_canvas2.cpp
@@ -566,7 +566,7 @@
 
     qreal scaleX, scaleY;
     converter->imageScale(&scaleX, &scaleY);
-    d->displayShader->setUniformValue(d->displayShader->location(Uniform::ViewportScale), (GLfloat) scaleX);
+    d->displayShader->setUniformValue(d->displayShader->location(Uniform::ViewportScale), (GLfloat) (scaleX * devicePixelRatioF()));
     d->displayShader->setUniformValue(d->displayShader->location(Uniform::TexelSize), (GLfloat) d->openGLImageTextures->texelSize());
 
     QRect ir = d->openGLImageTextures->storedImageBounds();
@@ -666,7 +666,7 @@
 
             if (currentLodPlane > 0) {
                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
-            } else if (SCALE_MORE_OR_EQUAL_TO(scaleX, scaleY, 2.0)) {
+            } else if (SCALE_MORE_OR_EQUAL_TO(scaleX * devicePixelRatioF(), scaleY * devicePixelRatioF(), 2.0)) {
                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
             } else {
@@ -684,7 +684,7 @@
                     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
                     break;
                 case KisOpenGL::HighQualityFiltering:
-                    if (SCALE_LESS_THAN(scaleX, scaleY, 0.5)) {
+                    if (SCALE_LESS_THAN(scaleX * devicePixelRatioF(), scaleY * devicePixelRatioF(), 0.5)) {
                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
                     } else {
                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);