this.camera.getPicture(options).then((imageData) => {
        this.myphoto = 'data:image/jpeg;base64,' + imageData;
        this.b64toBlob(this.myphoto, 'image/jpeg', 512);
    }, (err) => {
        // Handle error
    });

b64toBlob(b64Data: string, contentType: string, sliceSize: number) {
    contentType = contentType || '';
    sliceSize = sliceSize || 512;

    var byteCharacters = atob(b64Data.replace(/^data:image/(png|jpeg|jpg);base64,/, ''));
    var byteArrays = [];

    for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
        var slice = byteCharacters.slice(offset, offset + sliceSize);

        var byteNumbers = new Array(slice.length);
        for (var i = 0; i < slice.length; i++) {
            byteNumbers[i] = slice.charCodeAt(i);
        }

        var byteArray = new Uint8Array(byteNumbers);

        byteArrays.push(byteArray);
    }