Converting image to RGB16 in array

[Kris Revi]

Code

void MainWindow::selectedImageDisplay(QString img)
{
    QImage imageObject;    // Make a new imageObject
    imageObject.load(img); // Load the image from path

    imageObject = imageObject.convertToFormat(QImage::Format_RGB16);

    QJsonArray RGB565;
    for(int y = 0; y < 128; y++)
    {
        const quint16 *line = reinterpret_cast<const quint16*>(imageObject.constScanLine(y));
        for(int x = 0; x < 128; x++)
        {
            RGB565 << *(line++);
        }
    }
    socket.sendCommandStrip(QStringLiteral("pixArt"), RGB565);
}

Question
Is it possible to make this smaller in size?
the reason for this is the ESP32 does not have enough memory for this... when i send this over and use ArduinoJson lib to deserializeJson i end up with error DeserializationError::NoMemory

[SGaist]

Hi,

How much memory do you have available on that device ?

[Kris Revi]

@SGaist

Free Heap Size Befor Matrix : 330604
*** ESP32-HUB75-MatrixPanel-I2S-DMA: Memory Allocations Complete ***        
Total memory that was reserved: 132 kB.
... of which was used for the DMA Linked List(s): 4 kB.
Heap Memory Available: 192340 bytes total. Largest free block: 113792 bytes.
General RAM Available: 123968 bytes total. Largest free block: 113792 bytes.
Free Heap Size after Matrix : 192196
[WIFI][STATUS] Connecting to WiFi..
[WIFI][STATUS] Connected
Free Heap Size after Wifi : 135128
Free Heap Size after Socket : 135008

Free Heap Size after Socket : 135008 is what im left with

this does not include DynamicJsonDocument inData(128*128); (and i belive even 128*128 is not even big enough)
and
uint16_t pixelArt[128*128] = { }; i copy the array from json into this and then over to the Matrix Display

[SGaist]

You might need to send your image in smaller chunks and process these chunks on your device.

[Kris Revi]

Never done that befor

[SGaist]

Never done what ?