diff --git a/.github/workflows/gg_regressions_ci.yml b/.github/workflows/gg_regressions_ci.yml
index 0612d2ef8d..d8e2f69bdc 100644
--- a/.github/workflows/gg_regressions_ci.yml
+++ b/.github/workflows/gg_regressions_ci.yml
@@ -21,10 +21,13 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Build local v
-        run: make -j4
+        run: make
+
+      - uses: openrndr/setup-opengl@v1.1
 
       - name: Setup dependencies
         run: |
+          # imagemagick              : convert, mogrify
           # xvfb                     : xvfb (installed by openrndr/setup-opengl@v1.1)
           # openimageio-tools        : idiff
           # libxcursor-dev libxi-dev : V gfx deps
@@ -33,14 +36,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install imagemagick openimageio-tools mesa-common-dev libxcursor-dev libxi-dev freeglut3-dev
           wget https://raw.githubusercontent.com/tremby/imgur.sh/c98345d/imgur.sh
+          git clone https://github.com/Larpon/gg-regression-images gg-regression-images
           chmod +x ./imgur.sh
 
-      - uses: openrndr/setup-opengl@v1.1
-      - uses: actions/checkout@v2
-        with:
-          repository: Larpon/gg-regression-images
-          path: gg-regression-images
-
       - name: Sample and compare
         id: compare
         continue-on-error: true
@@ -52,4 +50,5 @@ jobs:
         if: steps.compare.outcome != 'success'
         run: |
           ./imgur.sh /tmp/fail.png
+          ./imgur.sh /tmp/diff.png
           exit 1
diff --git a/cmd/tools/vgret.v b/cmd/tools/vgret.v
index a9ae1c71a0..b66fb70f2f 100644
--- a/cmd/tools/vgret.v
+++ b/cmd/tools/vgret.v
@@ -37,7 +37,7 @@ import flag
 import toml
 
 const (
-	tool_name        = os.file_name(os.executable())
+	tool_name        = 'vgret'
 	tool_version     = '0.0.1'
 	tool_description = '\n  Dump and/or compare rendered frames of `gg` based apps
 
@@ -57,7 +57,7 @@ Examples:
 const (
 	supported_hosts = ['linux']
 	// External tool executables
-	v_exe           = vexe()
+	v_exe           = os.getenv('VEXE')
 	idiff_exe       = os.find_abs_path_of_executable('idiff') or { '' }
 )
 
@@ -105,11 +105,27 @@ mut:
 	config Config
 }
 
+fn (opt Options) verbose_execute(cmd string) os.Result {
+	opt.verbose_eprintln('Running `$cmd`')
+	return os.execute(cmd)
+}
+
+fn (opt Options) verbose_eprintln(msg string) {
+	if opt.verbose {
+		eprintln(msg)
+	}
+}
+
 fn main() {
-	if os.args.len == 1 {
-		println('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
+	if runtime_os !in supported_hosts {
+		eprintln('$tool_name is currently only supported on $supported_hosts hosts')
 		exit(1)
 	}
+	if os.args.len == 1 {
+		eprintln('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
+		exit(1)
+	}
+
 	mut fp := flag.new_flag_parser(os.args[1..])
 	fp.application(tool_name)
 	fp.version(tool_version)
@@ -131,17 +147,17 @@ fn main() {
 	}
 
 	toml_conf := fp.string('toml-config', `t`, default_toml, 'Path or string with TOML configuration')
-
-	ensure_env(opt) or { panic(err) }
-
-	arg_paths := fp.finalize() or { panic(err) }
-
+	arg_paths := fp.finalize()?
 	if arg_paths.len == 0 {
 		println(fp.usage())
 		println('\nError missing arguments')
 		exit(1)
 	}
 
+	if !os.exists(tmp_dir) {
+		os.mkdir_all(tmp_dir)?
+	}
+
 	opt.config = new_config(opt.root_path, toml_conf)?
 
 	gen_in_path := arg_paths[0]
@@ -154,13 +170,15 @@ fn main() {
 		all_paths_in_use := [path, gen_in_path, target_path]
 		for path_in_use in all_paths_in_use {
 			if !os.is_dir(path_in_use) {
-				panic('`$path_in_use` is not a directory')
+				eprintln('`$path_in_use` is not a directory')
+				exit(1)
 			}
 		}
 		if path == target_path || gen_in_path == target_path || gen_in_path == path {
-			panic('Compare paths can not be the same directory `$path`/`$target_path`/`$gen_in_path`')
+			eprintln('Compare paths can not be the same directory `$path`/`$target_path`/`$gen_in_path`')
+			exit(1)
 		}
-		compare_screenshots(opt, gen_in_path, target_path) or { panic(err) }
+		compare_screenshots(opt, gen_in_path, target_path)?
 	}
 }
 
@@ -184,21 +202,15 @@ fn generate_screenshots(mut opt Options, output_path string) ? {
 			rel_out_path = file
 		}
 
-		if opt.verbose {
-			eprintln('Compiling shaders (if needed) for `$file`')
-		}
-		sh_result := os.execute('${os.quoted_path(v_exe)} shader ${os.quoted_path(app_path)}')
+		opt.verbose_eprintln('Compiling shaders (if needed) for `$file`')
+		sh_result := opt.verbose_execute('${os.quoted_path(v_exe)} shader ${os.quoted_path(app_path)}')
 		if sh_result.exit_code != 0 {
-			if opt.verbose {
-				eprintln('Skipping shader compile for `$file` v shader failed with:\n$sh_result.output')
-			}
+			opt.verbose_eprintln('Skipping shader compile for `$file` v shader failed with:\n$sh_result.output')
 			continue
 		}
 
 		if !os.exists(dst_path) {
-			if opt.verbose {
-				eprintln('Creating output path `$dst_path`')
-			}
+			opt.verbose_eprintln('Creating output path `$dst_path`')
 			os.mkdir_all(dst_path)?
 		}
 
@@ -221,18 +233,13 @@ fn compare_screenshots(opt Options, output_path string, target_path string) ? {
 	mut warns := map[string]string{}
 	for app_config in opt.config.apps {
 		screenshots := app_config.screenshots
-		if opt.verbose {
-			eprintln('Comparing $screenshots.len screenshots in `$output_path` with `$target_path`')
-		}
+		opt.verbose_eprintln('Comparing $screenshots.len screenshots in `$output_path` with `$target_path`')
 		for screenshot in screenshots {
 			relative_screenshot := screenshot.all_after(output_path + os.path_separator)
 
 			src := screenshot
 			target := os.join_path(target_path, relative_screenshot)
-
-			if opt.verbose {
-				eprintln('Comparing `$src` with `$target` with $app_config.compare.method')
-			}
+			opt.verbose_eprintln('Comparing `$src` with `$target` with $app_config.compare.method')
 
 			if app_config.compare.method == 'idiff' {
 				if idiff_exe == '' {
@@ -242,14 +249,9 @@ fn compare_screenshots(opt Options, output_path string, target_path string) ? {
 					'.diff.tif')
 				flags := app_config.compare.flags.join(' ')
 				diff_cmd := '${os.quoted_path(idiff_exe)} $flags -abs -od -o ${os.quoted_path(diff_file)} -abs ${os.quoted_path(src)} ${os.quoted_path(target)}'
-				if opt.verbose {
-					eprintln('Running: $diff_cmd')
-				}
-
-				result := os.execute(diff_cmd)
-
-				if opt.verbose && result.exit_code == 0 {
-					eprintln('OUTPUT: \n$result.output')
+				result := opt.verbose_execute(diff_cmd)
+				if result.exit_code == 0 {
+					opt.verbose_eprintln('OUTPUT: \n$result.output')
 				}
 				if result.exit_code != 0 {
 					eprintln('OUTPUT: \n$result.output')
@@ -278,15 +280,19 @@ fn compare_screenshots(opt Options, output_path string, target_path string) ? {
 		}
 		first := fails.keys()[0]
 		fail_copy := os.join_path(os.temp_dir(), 'fail.' + first.all_after_last('.'))
-		os.cp(first, fail_copy) or { panic(err) }
+		os.cp(first, fail_copy)?
 		eprintln('First failed file `$first` is copied to `$fail_copy`')
 
 		diff_file := os.join_path(os.temp_dir(), os.file_name(first).all_before_last('.') +
 			'.diff.tif')
 		diff_copy := os.join_path(os.temp_dir(), 'diff.tif')
 		if os.is_file(diff_file) {
-			os.cp(diff_file, diff_copy) or { panic(err) }
+			os.cp(diff_file, diff_copy)?
 			eprintln('First failed diff file `$diff_file` is copied to `$diff_copy`')
+			eprintln('Removing alpha channel from $diff_copy ...')
+			final_fail_result_file := os.join_path(os.temp_dir(), 'diff.png')
+			opt.verbose_execute('convert ${os.quoted_path(diff_copy)} -alpha off ${os.quoted_path(final_fail_result_file)}')
+			eprintln('Final diff file: `$final_fail_result_file`')
 		}
 		exit(1)
 	}
@@ -295,25 +301,16 @@ fn compare_screenshots(opt Options, output_path string, target_path string) ? {
 fn take_screenshots(opt Options, app AppConfig) ?[]string {
 	out_path := app.screenshots_path
 	if !opt.compare_only {
-		if opt.verbose {
-			eprintln('Taking screenshot(s) of `$app.path` to `$out_path`')
-		}
-
+		opt.verbose_eprintln('Taking screenshot(s) of `$app.path` to `$out_path`')
 		if app.capture.method == 'gg_record' {
 			for k, v in app.capture.env {
 				rv := v.replace('\$OUT_PATH', out_path)
-				if opt.verbose {
-					eprintln('Setting ENV `$k` = $rv ...')
-				}
+				opt.verbose_eprintln('Setting ENV `$k` = $rv ...')
 				os.setenv('$k', rv, true)
 			}
 
 			mut flags := app.capture.flags.join(' ')
-			v_cmd := '${os.quoted_path(v_exe)} $flags -d gg_record run ${os.quoted_path(app.abs_path)}'
-			if opt.verbose {
-				eprintln('Running `$v_cmd`')
-			}
-			result := os.execute('$v_cmd')
+			result := opt.verbose_execute('${os.quoted_path(v_exe)} $flags -d gg_record run ${os.quoted_path(app.abs_path)}')
 			if result.exit_code != 0 {
 				return error('Failed taking screenshot of `$app.abs_path`:\n$result.output')
 			}
@@ -329,30 +326,6 @@ fn take_screenshots(opt Options, app AppConfig) ?[]string {
 	return screenshots
 }
 
-// ensure_env returns nothing if everything is okay.
-fn ensure_env(opt Options) ? {
-	if !os.exists(tmp_dir) {
-		os.mkdir_all(tmp_dir)?
-	}
-
-	if runtime_os !in supported_hosts {
-		return error('$tool_name is currently only supported on $supported_hosts hosts')
-	}
-}
-
-// vexe returns the absolute path to the V compiler.
-fn vexe() string {
-	mut exe := os.getenv('VEXE')
-	if os.is_executable(exe) {
-		return os.real_path(exe)
-	}
-	possible_symlink := os.find_abs_path_of_executable('v') or { '' }
-	if os.is_executable(possible_symlink) {
-		exe = os.real_path(possible_symlink)
-	}
-	return exe
-}
-
 fn new_config(root_path string, toml_config string) ?Config {
 	doc := if os.is_file(toml_config) {
 		toml.parse_file(toml_config)?