images - array of bytes TO png jpeg

[bunak]

I have images that fill by bytes.
This images- 1024х1280х1- opened in Photoshop as RAW - format, with parameter depth - 8 Bits, Count - 1, Width, Height

In code image save in

Code: [Select]

imageBuf: array[0..1279, 0..1023] of byte;
Is it possible convert this array of bytes to jpeg or png

[bunak]

Do like this

Code: [Select]

  mem_st := TMemoryStream.Create;
  Img := TSingleImage.Create;
  try
    mem_st.WriteBuffer(imageBuf, 1280 * 1024);
    mem_st.Position := 0;
    Img.LoadFromStream(mem_st);
    Img.SaveToFile(DirSave_path + '\' + node_img_name.NodeValue + '.jpg');
  finally
    mem_st.Free;
    Img.Free;
  end;

In result - is nothing

[Galfar]

There's no need to load the image from somewhere if it's already in memory. You can just create empty image with desired size and format, and then copy memory from your imageBuf to image's Bits property.

[bunak]

Thank you

Help me please
I do like this

Code: [Select]

var
  singl_Img: TSingleImage;
  Img : TImageData;
begin
  if not NewImage(img_W, img_H, ifIndex8, Img) then Exit;
  CopyMemory(Img.Bits, @imageBuf[0], Img.Size);
  singl_Img.CreateFromData(Img);

  try
    singl_Img.SaveToFile(DirSave_path + '\' + node_img_name.NodeValue + '.jpg');
  finally
    singl_Img.Free;
  end;
but get "Access violation" error on singl_Img.CreateFromData(Img);

the error erise in this procedure

Code: [Select]

{ TBaseImage class implementation }
constructor TBaseImage.Create;
begin
  SetPointer;
end;

[bunak]

And in result i do like this, and I happy

Code: [Select]

  singl_Img := TSingleImage.Create;
  singl_Img.CreateFromParams(img_W, img_H, ifGray8);
  CopyMemory(singl_Img.Bits, @imageBuf[0], singl_Img.Size);

  try
    singl_Img.SaveToFile(DirSave_path + '\' + img_name + '.' + cmbx_ImageExt.Text);
  finally
    singl_Img.Free;
  end;