I tried it with the following code with a larger image: import ModelIO if #available(macOS 11.0, *) { var floatData = UnsafeMutableBufferPointer<Float32>.allocate(capacity: 16*16) for i in 0..<256{     if (i%2 == 0){         floatData[i] = Float32(0.99)     } else {         floatData[i] = Float32(0)     } }     let floatBuffer = Data(buffer: floatData)     let exrImg = MDLTexture(data: floatBuffer,                             topLeftOrigin: true,                             name: "output.exr",                             dimensions: SIMD2<Int32>(16,16),                             rowStride: 16 * MemoryLayout<Float32>.size,                             channelCount: 1,                             channelEncoding: MDLTextureChannelEncoding.float32,                             isCube: false)      let resourcesURL = URL(fileURLWithPath: "/Users/myDirectory", isDirectory: true)     let fileName = resourcesURL.appendingPathComponent(exrImg.name)     if(exrImg.write(to: fileName)){             print("Success! Image written in disk")      } else {             print("could not write image")         } } else {     // Fallback on earlier versions } I get the following runtime error: Error>: kvImagePrintDiagnosticsToConsole: vImageConverter: In this version of the converter, most pixel formats must be packed arrays of samples with no empty space, except as appropriate for kCGImageAlphaNoneSkipFirst/Last. Here, the colorspace has 1 channels, with 1 more for alpha, which should mean (1+1 channels/pixel)*16 bits per channel = 32 bits per pixel.  You passed 16 in format->bitsPerPixel. doubling the size of the buffer and changing the Float32 to Float16 did not work either. The write method returns false.