exImage.cpp

Convert and save a grayscale image. Load the Vision cover, convert its GPU-resident RGB pixels to Rec.709 grayscale, save the semantic Gray image, and optionally inspect it in Viewer.

ExSDK source-ownedC++Vision

Source

Vision · Vulkan compute

sdk/cpp/examples/vision/image.cpp

Load the Vision cover, convert its GPU-resident RGB pixels to Rec.709 grayscale, save the semantic Gray image, and optionally inspect it in Viewer.

API

Example

1#include <oa/oa.h>
2
3OA_MAIN_PREVIEW("ExampleVisionImage") {
4	auto sourceResult = oa::FnImage::decodeFile(
5		oa::Paths::asset("image/coverVision.jpg"), oa::ImageFormat::Rgb);
6	if (not sourceResult.isOk()) return 1;
7	auto source = oa::move(sourceResult).getValue();
8
9	auto grayscale = oa::FnImage::grayscale(source);
10
11	const oa::Path output = oa::Paths::var("example/vision/coverVisionGrayscale.jpg");
12	if (not oa::Filesystem::createDirectories(output.parentPath()).isOk()) return 1;
13	if (not oa::FnImage::saveFile(output, grayscale, 92U).isOk()) return 1;
14
15	if (not grayscale.validate()) return 1;
16	if (grayscale.width() != 1672 or grayscale.height() != 941) return 1;
17	if (grayscale.format() != oa::ImageFormat::Gray) return 1;
18	if (not oa::Filesystem::isFile(output)) return 1;
19
20	oa::print("Saved grayscale image: {}", output.cStr());
21
22	if (argc > 1 and oa::StringView(argv[1]) == "--preview") {
23		oa::ViewerConfig previewConfig;
24		previewConfig.mode = oa::ViewerMode::Image;
25		previewConfig.title = "OA vision · grayscale cover";
26		previewConfig.width = 1280U;
27		previewConfig.height = 646U;
28		if (not oa::Viewer::preview(engine, oa::Paths::var("example/vision/coverVisionGrayscale.jpg").string(),
29			previewConfig).isOk()) {
30			return 1;
31		}
32	}
33	return 0;
34}
35

Output

Before / after. Compare the checked RGB source with the exact grayscale JPEG written by this example.

OA Vision cover showing a glitched figure in a modern room — source
Vision cover
Download image
The full-resolution RGB source decoded through oa::FnImage.
1672×941 · image/webpSHA-256 5271445056df76a1f38b47e7b5d3000e6cbb07bd2a038537c081b296fe5916ceOA-authored Vision module cover

OA Vision cover converted from RGB to grayscale — processed
Grayscale output
Download image
The full-resolution Rec.709 grayscale image converted on the GPU and saved by the source-owned example.
1672×941 · image/webpSHA-256 4dce1fb04dc03ac5cb65df3a82d34fbfa077f3016049863f956baf7076053849sdk/py/examples/vision/image.py

Present

The Output section above remains the exact artifact evidence. These captures document the current interactive Viewer surface used by the presentation path.

Source

Example

Output

Vision cover

Grayscale output

Present

Grayscale preview