[Bug] request or feature?

[VladimirKondratenko]

What feature or change would you like to see made?

How i can convert my first picture to png format for preview? could you help me with it?
If i correct understand it's work how on picture. But i saw functions
//retrieveInstance - 403 error
//retrieveInstanceFramesThumbnail - 403 error
//retrieveInstanceRendered - 403 error
I tried connect with your dicom pictures and have 403 error, Explain me please correct approach for show preview first frame.
Could you explain me please, how you did it preview? and important question you take preview from backend or it's first frame from your dicom? or may be you use retrieveInstanceRendered function?
Thanks

Why should we prioritize this feature?

it's very important features for project, but i don't know how i can ask help, because on forum ohif many questions without answers. Sorry. My function example this

[VladimirKondratenko]

`export async function convertWadorsToJpg(wadorsUrl, client = null) {
try {
// Parse WADO-RS URL to get components
const urlParts = wadorsUrl.replace('wadors:', '').split('/');
const wadoRsRoot = urlParts.slice(0, urlParts.indexOf('studies')).join('/');
const studyUid = urlParts[urlParts.indexOf('studies') + 1];
const seriesUid = urlParts[urlParts.indexOf('series') + 1];
const instanceUid = urlParts[urlParts.indexOf('instances') + 1];
const frameNumber = parseInt(urlParts[urlParts.indexOf('frames') + 1]);

// Create client if not provided
client =
  client ||
  new api.DICOMwebClient({
    url: wadoRsRoot,
    singlepart: true,
  });

//retrieveInstance - 403 error
//retrieveInstanceFramesThumbnail - 403 error
//retrieveInstanceRendered - 403 error
// Retrieve frame as JPEG
const frameArrayBuffer = await client.retrieveInstanceRendered({
  studyInstanceUID: studyUid,
  seriesInstanceUID: seriesUid,
  sopInstanceUID: instanceUid,
  frameNumbers: [frameNumber],
  mediaType: 'image/png',
});

console.log('frameArrayBuffer', frameArrayBuffer);
// Convert ArrayBuffer to base64
const binary = new Uint8Array(frameArrayBuffer);
console.log('binary', binary);
const base64 = btoa(
  binary.reduce((data, byte) => data + String.fromCharCode(byte), ''),
);
console.log('base64', base64);

return `data:image/png;base64,${base64}`;

} catch (error) {
console.error('Error converting WADO-RS to JPG:', error);
throw error;
}
}`